Panasonic RR-830 Desktop Cassette Transcriber / Recorder "controller longer working" Questions

Speed control no longer works when tape speed is on 1.2. Is this possible to fix myself? it will be hard unless you have a some Electronics background there is a Servo motor with a control unit one of

During transcription, when you release the foot pedal, the tape automatically rewinds a little so you can resume easily. This no longer happens with my machine. I have tried several foot pedals, but ...

Mikomi ET858 digital voice recorder suddenly switched from saving files as .WAV to .ACT, whatever that is. Can play interviews on machine itself, but can't save them to computer. Help! How do I switch