have you verified that it is the keyboard or the pedal? If you have not, I suggest plugging in another pedal into SwitchPedal2 and see if that works, since replacing the pedal will be relatively inexpensive... otoh, it also seems likely that the connector in the PC88 for SwitchPedal2 may have an issue, which is common for inputs like this, and that problem as well should be relatively inexpensive to fix. for either of those you don't need someone who is an PC88 repair person, just some simple electronics know-how...

peace
-cpr