Faders started failing back in 2007, a friends EDIT PACK went dead, Clock segment on my main unit went black on one of the counters, faders started failing.
So now what? Well I went out and bought another main control unit for 400.00 to scavenge parts but what if you just want the parts? Well hit and miss as there are some fader replacement parts out there on eBay and gearslutz but usually rebuilts and they break! Simple cure that worked 75% of the time, REMOVE THE BAD/SUSPECT fader and CLEAN IT ! Clean the rails with Iso Alcohol and voila reborn 3 out of 4 times.
HOW TO REMOVE THE FADER on PROCONTROL Units
Simple just remove all the small allen flat pan screws on the TOP of the unit then lift up, (12-16 screws on fader & edit packs). Don't get stumped and start unscrewing any side or bottom screws, not necessary.
HOW TO REMOVE & REPLACE POWER SUPPLY
They are mostly SKYNET power supplies and run around $72.00-$85.00. These guys repair them: SIRES.
DEAD SEGMENT ON COUNTER CHIP
Well this one requires removing the TOP. Unscrew all back screws, remove long vented panel by tilting back and up and out. More on this later as I have not tackled it yet. I'm hoping the Counter chips are plugged into sockets...
Hope this helps some of you and feel free to comment if it did!