I have a Jobo ATL-3000 and when I turned it on tonight it went through the self test test, as always. Instead of passing, it stops when it gets to the drum motor test and tells me "Error in test". The gears go around, and I put an empty drum in the machine and it turns it, so the motor clearly is working. With the lift arm raised, the transfer gears turn smoothly. Ideas of what has gone wrong? Of course it worked just fine last time I used it.