Slideouts suddenly not working

We have a 2012 Thor Challenger with three slideouts. All was working fine until we took it to a shop for a routine service (plus re-caulking of the roof). Now even when plugged in to shore power, or running the generator, the three slideouts don't work - and in fact I don't even hear the slide motors come on and try. I think everything else is working - the AC, microwave oven, and electric fireplace. The breakers and fuses in the panel look okay. I should mention that we did replace the two six volt batteries for house power just recently - but the slides worked fine after that. Any ideas of what might be going on, or how to track down this problem?