Here are some parts from Tesla you might want if you have your pack out. They are relatively inexpensive and even though you can clean a lot of this up and reuse, it is nice to reset with new bits. Remember that some of the parts are unique to the style of battery you have so the newer version of the same description won't necessarily fit. You can do your own search on Tesla's Parts Catalog and place an order with the SC.
Tesla doesn't have a parts counter like a traditional car dealership where you can just walk in and buy/order anything you want. They have a long list of parts they won't sell to customers - specifically parts related to high voltage components like the battery. You can make a request on the app for 'service' to request a list of parts and get an appointment and go back and forth over messages in the app until they tell you the parts have arrived and you can pick them up but I find it more effective to drive to the Service Center (SC) and walk up to the counter at the service department.
Even that is not foolproof because hundreds of parts are listed as 'over the counter' that are restricted from purchase by regular customers and the best part is that list is always changing. For instance, the first time I tried to buy a fuse cover (listed below), they wouldn't sell it to me. Several months later at a different SC, they did sell it to me. Last year, the same part was again, not available OTC. Their system is horrible and their corporate attitude towards DIY repair is worse but blame the mother-ship, not the people behind the counter.
Fuse Cover for V1 packs - prone to corrosion so good to replace when pack is out. Approximate retail $31.00
COVER, FUSE TOP PANEL(6010488-00-D)
You want some combination of new Umbrella Valves/Plugs/Breathers discussed here. Each Part Number is a set of 6 and you need 14 sets to do the whole pack. I recently bought a combination 'set' of 14 for $55 which saves some money off buying individual ones but I can't find the part number - update needed.
Umbrella Valve set that includes 2 plugs, 2 Umbrella Valves and 2 Gore Breathers (Current on V2 packs). Approximate retail $5.00 (set of 6 - need 14 module bays' worth)
ASY,VENTS,GANGED,HVBATT(1517973-00-A)
Umbrella Valve set that includes 4 Umbrella Valves and 2 plugs - Approximate retail $4.00
VENT ASSEMBLY WITH UMBRELLAS AND O-RINGS(1026758-00-D)
Umbrella Valve set that is only plugs (no umbrella valves). Recommended to install just plugs in the front bay on each side where the most debris collects.
UMBRELLA VENT PLUG -FRONT(1015618-00-C)
A new Rapidmate Ring if you install a newer pack in your pre April 2016 car.
HV Rapidmate Ring needed when installing V2 pack in vehicles built before April 11th 2016. Installs on V2 pack, not on the car side. Approximate retail $4.80
HIGH VOLTAGE RAPIDMATE TOP RING - HIGH VOLTAGE BATTERY 2.0(1041311-00-C)
You may want to refresh your ski rails that cover your Umbrella Valves. Note - V1 parts don't fit V2 and vice versa.
Skirt bits for V1 packs
ASY,SKI,SIDE RAIL,ECOAT,ENCLOS 1.0 PACK Only for all 1.0 Enclosures 1450645-01-A (Need 2 - one per side)
Skirt bits for V2 packs
ASY,SKI,SIDE RAIL,ECOAT,ENCLOSURE For all 1.5 and 2.0 enclosures 1096346-01-A (Need 2 - one per side)
If you have an older pyro fuse, you want to replace it with the current part that is powered by the voltage of the HV battery itself - especially if you have the version with the onboard batteries that are only rated at 8 years. As mentioned above, you will likely need to get these from eBay since Tesla won't sell one to normal people. I am unsure which configuration needs the 2,366A version but likely 400V higher capacity packs with Performance motors and perhaps upgrades like Insane+ or Ludicrous Mode.
DISCONNECT - PYROTECHNIC - CUR POWERED - 2000A NOT(cfg_energy == Energy100) 1111313-00-F
DISCONNECT - PYROTECHNIC - CUR POWERED - 2366A (cfg_energy == Energy100) 1111445-00-F
G48 Coolant - The car takes a 50/50 mix and you can find concentrate if you look (better value)
Four long M5 .75 bolts to use as locating pins when reinstalling the lid.
Four long M8 1.25 bolts to use as locating pins when reinstalling the pack.
3 Tubes of Sikaflex-221 for gluing down the lid. This is not the exact material Tesla uses but it is a little easier to work with because it doesn't set up as quickly. We are DIYers so we need more time than the pros. Amazon Link
1 tube of The Right Stuff Gasket maker from Permatex for around the fuse cover and coolant rapidmate.
Butyl Tape like this one from Amazon. There are lots of options. The important thing you want is 1/8" thick and 30' long. I used 3/4" wide and it seemed to be about right but 1/2" would probably work too.
A set of 5/16" rubber caps to keep the modules from dribbling coolant all over everything when you move them around. Something like this looks like a good value.