yep, the encoders are also a bit buggy, sometimes they jump many steps or no steps at all. I'm not sure if there is a problem with the buttons because when the front panel does respond, either all the controls work (to an extent), or don't work at all. Thank you for the service manual! I'll have to review it some more. One annoying thing is that the text encoding is all messed up, making it hard to search, and copy paste keywords. But I'll manage