Your fuse blocks maybe similar to this one
All slide info is in QT's 1 & 2.
If you have 12v slide locks try tapping gently on lock cylinder to see if slide will operate or you may have a switch problem for slide operation found in link I gave you.
You can also find slide lock problems fixes in PROBLEM SOLVERS of QT's # 3.
Only operate slides with shore power plugged in or GEN running for a good 12v's for slide motors.
Did you get your electric step fixed??