Dave P

I had the exact issue. Luckily my slide hydraulic pump quit working when the slide was only out about 4 inches. There was no way to move it back in or to extend it fully. The override procedure I located in the manual did not work, fortunately I was at home and not on the road. Lippert was great but it did take nearly 5 weeks for them to build, ship and receive the new motor and pump.  
 

2008 Monaco Camelot 40PDQ

I am dealing with the exact same issue on my 2008 Camelot. I've had it at the shop and it starts working so the shop can never diagnose it. Please keep posting if you find the problem. Also, I had no previous repair when it started, the gauges just locked up and stopped moving. 

Not sure this will fit yours but most likely. Also read somewhere most Monaco’s used a Chevrolet truck switch near the same year as the coach. Napa Auto Parts would probably be able to find it if you take the old one to them. 
 

hope this helps