I have the same problem, same machine. Recording or playback of recorded disks won't work. To play back purchased films, documentaries, etc, change 'DRIVE SELECT' to VHS before inserting DVD. Don't know if this works for recording though.
To get rid of 'U61', probably turn it off at the wall (that's what I did) and remove any DVD, video tape or SD card in any of the drives.
Timoooooooooo!!!!!!, May 2008