Yamaha PSR 410 abnormal operation of the tool

Yamaha Psr-410 pitch bend twitching when I try to raise the tone. (When lowering the pitch, the pitch bend works fine. And one more problem: when I turn on the auto-accompaniment mode, the accompaniment plays a half tone higher than the right side of the keyboard. However, when the accompaniment is turned off, the musical scale is normal.Has anyone encountered such a problem?

PS: tests No. 1, No. 2, given in the service manual, do not pass.

I would suggest do a Factory Reset first !!

You will loose all user stored parameters but that is the purpose of doing it in the first place.

Your failing tests - can you be more specific in your description - ie do you mean

Mode1;Test#1 and Mode1;Test#2