If cycling the DC power did not fix it (it does for me), then you can get a little battery, like a motorcycle one, and hot wire the motor underneath, or and I am not sure how, disconnect something which allows it to slide without the motor. EM I think knows what to disconnect, but it really should be clear, once you get on the stomach and look around. THere are rocker switches on the HWH panel for all the slides, and smartbeds to work. My DS SB operate from switches in the Services Bay (water tank fill, etc).
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech