Guide :Music : NP 30 76 Key Lightweight Digital Grand Piano with Touch...
Roland 3000 Digital Piano 88-Key Full-size weighted keyboard
Some keys don't work at all (two); several keys must be played quite firmly in order to work. This occurs across all voices.
Oh, and one key sticks.
1) what causes this
2) who is my best bet for a correct fix - electronics specialist, music store, ???
3) who can likely fix it right, for the least $$$ (I'm broke)