Post got me thinking... I've either been a lucky bastard, or pro and semi-pro analog gear is made pretty well. (My digital stuff? Almost every Nikon body has needed a repair at some point, but I do shoot for a living. Of course, I shot film for a living, too, and never needed a repair...)
Nikon 8008, 8008s... run like new.
Forscher pro back - works like new.
Nikon N90s - had to clean the sticky rubberized stuff off the back. Other than that, like new.
Nikon FG - a champ.
Canon FTQL, 50mm and 35mm - love it. No issues. Big-ass metal brick.
RB67 Pro S - just gave it a reseal and re-foam. Works like a champ.
Re foamed two backs, weren't leaking but were crusty.
RB 90 and 250 glass - works like new.
RB 180 (main squeeze, I have two) - 1 needed a teardown and cleaning for stuck shutter. All parts fine. 1 minute soak and the shutter popped open.
Nikkor 85mm 1.8 AF-D - AF drive screw disappeared one day. Still a great MF lens.
Nikkor 50 1.8 AF, 100 2.8, etc - like new - some of those 2 decades old.
Nikkor 80-200 2.8 AF - fine, but electronically doesn't seem to send the correct exposure info. Shoots hot.
Minolta HiMatic 7 - lens screws were loose and shutter sticking. 20 minutes and it's good as new.