Bedroom Slide won't Extend

It could be air in the system. Cycle the slides several times to work the air out. The other things I would consider are low battery voltage. Pull the battery and have it checked for a shorted cell. Another possible cause is the solenoid. The contacts inside the solenoid can get dirty. The solenoid will still click, but the contacts won't let enough current pass to operate the slides. Check it by installing an amp gage between the solenoid terminal and the pump.

I'm having the same issue with my FW. I just haven't had the time to deal with it.