CP1 issue

[J1mR@df0rd]

After a two-year period of inactivity, I recently set up the CP1 and upon powering it up, it sounds unusually muddy. Tone is not good. EQ is terrible. Highs and lows are kind of meshed together. It didn't sound like this the last time I played it. I have been using an older CP300 as a practice and gigging keyboard. I temporarily "retired" the CP1, although that was my main keyboard for four-or-five years, and going back to it only a couple of weeks ago, I found it to be practically unplayable. Nothing wrong with the action or settings (that I know of); it just sounds bad now. I have heard that if electronic gear sits around too long without being played, things go sideways. I have 3 questions: 1) does anyone else have any similar experience; 2) can it be checked and repaired, and 3) what to do now.