I fixed a Technics SL-1200Mk2 turntable in the record store today (Good Records NYC if you ever want to come by and say hi) that had an issue with the speed slightly wavering. Pretty painless procedure - just opened the baby up and cleaned the speed adjustment pots.
I've listed a few resources for repairing/modding a Technics turntable if you should ever feel so inclined. These turntables are built like tanks. I'm pretty sure you could drop it down a flight of stairs and it would probably still work.
For basic info:
FAQ of Technics 1200Mk2/SL-1210Mk2 Turntables
For the DIYer:
Technics SL-1200Mk2 Service Manual
And last but not least, the MAN of Technics turntable mods: