Thanks for posting the pix. I have a P2500, so the keypad pix are fascinating to me. I see that epr electronics has the pcb with the keypad, but maybe they can shed some light on a possible repair. Also, maybe there's a schematic somewhere that has a part description and number. Good luck with the repairs. Please continue to share your results.
Steve
Keypad Assembly (MP7, XL7) | E-Mu Parts | EPR Electronics - Palm Harbor, Florida