At least on a 2013 Sanibel, the Landing Gear control valve is located in the propane locker. See picture:
Note that you'll have to remove the propane cylinder to get the Allen wrench in the hole.
The Slides override valve is in the front storage compartment next to the hydraulic pump.
This one is easy to get to.
In that same picture I show where the place is to drive the pump with a hex bit in an electric drill. At first I thought it was too cramped to put a drill above it, but there's 13-1/2 inches there, enough even for my 1/2" hammer drill!
Now if someone can give instructions for the electric bedroom slide, we're all set.