Don't know if i'm in the right place. I have an old Casio CPS 700 keyboard. All the electronics work great. But a number of keys stay stuck down and I can't find instructions for how to lubricate or otherwise fix this. Anybody know how to do this? I can't seem to find a service manual for it online anywhere. The problem is I disassembled it found a metal rod covering the ends of the keys that is welded in place, no screws. Thanks for any tips. Lou