Managed to repair my digital piano. Two of the c's stopped working. Turns out the fix was easy: I used some 9B pencil to rub the connectors on the piano, as they apparently work with graphite. There was a silicone bit I could take off to get to the connector.
Opening the piano up was by far the hardest part of this repair.
#RightToRepair
i had to read the phrase "Warrior Right to Repair" and now you've had to see it too https://uk.news.yahoo.com/military-might-finally-win-repair-173539619.html