Take off the mattress, there is a board with a piano hinge at the foot side of the bed. The board lifts up to reveal the fresh water tank and plumbing, some electrical components, and the 2 control boxes side by side.
As for the dinette slide, it is a different setup. It is not the schwintek slideout system. If you look in the basement compartment directly under the slidout, you will see a short shaft sticking out from the top of the compartment. It has a cotter pin in it, and a hex head. This is the manual override shaft for the slideout. You use a socket on it to bring the slidout in manually.
2013 Sunseeker 2500 TSF