Well, everything, really!
Scott: swap rear tyre for a 25 as the 28 was starting to touch the seat tube with the slightest amount of mud.
Trek: fit new rear gear cable to try and fix the weird shifting issues. Absolutely no joy whatever. Eventually removed the RD, an Alivio RD-M4000, and swapped it for the 22-year-old Altus that originally came off my Trek 800 Sport. Few tweaks, perfect. That's a 7-speed RD running 9-speed with no issues.
Other bits and bobs taken off, ready to sell.
Then
Scott again, fit and tweak the Alivio from the Trek. Seems fine, if not swap back to the original Sora with Wolf Tooth.
Marin: Basically a going over to make sure it works, and to remove extraneous parts. Dork disc removed itself, UV-rotten. Removed cages and toe straps from pedals. Remove extraneous front reflector. Tweaked front cones.Tweaked read canti. Damn, I'd forgotten what a pain they can be. Flooded both shifters with GT85 as neither was ratcheting correctly. Instant fix. Pumped tyres up fully, no big bangs!
A very tiring day, puctuated by totally unforecast showers. Grrrr...