Hello Mark,

but let's go through the KN 7000 once the test sequence, if you an error of the KN 7000 we displayed.
1.Turn off the power
2 Then, while pressing C # 3, D # 3 and C# 4 at the same time, turn the power on again.
3 You will see it ROM DEVICE TEST
4 press EXECUTE

The test takes about 20 seconds.
The result is displayed to you on 12 pages.

But I believe that the rubber dampers are worn below the button. A technician could renew it.

I hope you can understand my English?