I bet you won't find anyone local that has the ability to really dig into a KMD-150, even BK doesn't work on them, they ship them back to Europe where they were made last time I checked.
Don't think it needs much. Just put a new battery in it following the instructions here and all went smooth. Put it back in and nothing. Something may have come unplugged or possibly the switch or a fuse. Had no issues with battery and have done this kind of thing before. Just don't have the equipment to test with.