My board needs some love

I apologize if this isn't the best choice of forum, I don't see a Mixer or Yamaha forum, but I'd love some insight.....

We have a VERY used Yamaha 02R. We got from a friend at a GREAT price and have been thrilled with it for a few years. We know very little about its history, but it's not new and it has definitely seen its share of action.
My concern is the motorized faders are sticking. They're not sliding correctly. I've tired opening up the board to see if I could clean them, but I can't get to them easily. The inside of this board looks like it was designed to keep me out. Panels are mounted on top of each other, with cables and wires running everywhere. I couldn't get anywhere near the faders from the inside.
I know this board won't last forever, but we need to get as much use out of it as possible.
Does anyone have any good maintenance advice?
Thanks in advance,
-j
 
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