Galley Maid's website is indeed useless. However, their technical expert, reached by telephone, (he returned a message promptly) spent a good ifteen minutes with me trouble-shooting. I mentioned a crunching sound just before the unit quit. I had found that the chain had kinked in the locker and was stuck. He hypothesised that the 10-amp fuse in the junction box had blown due to overcurrent and the sound was from the chain in the locker. I went to the boat with much anticipation.
The box is in the locker opposite my line of view and, of course, I could not get my neck to bend 180 degrees to see the guts of the box. I found the glass fuse by feel with the circuit breaker on my main panel off and the 150 amp breaker switched off in the Galley Maid box. Of course, the fuse was intact. Depressing the foot switches still results in relays clicking, just no juice to the motor. I do not think it is bad relays because both the up and down relays were not engaged when the failure occured. The Galley Maid guy did not think any gears were sheared but trouble-shooting from 1000 miles away is difficult.
One responder suggested that I attempt to rotate the drum with the socket and bar. Galley Maid guy said that could not be done unless the gears were stripped allowing some movement but I suppose a few broken teeth in a gear assembly could jam up the works. So, I am on to the next steps which may be to remove the unit which, to me, is a huge project, very heavy, limited access to the chain locker. It's likely something I will pay a yard to do. If I do, I may follow Marin's choice to replace it with a Lofran Tigress. Galley Maid, while very well-recommended, is VERY expensive. The control box alone is $850 according to the Galley Maid guy.