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OK, I have spent some time working on the hose retract / extend problem on 760. After some research I found the unit is an Applied Wireless RCR 303B - PHFO part number 580272. It uses remote FOB number KTX303b2. I found the remote-control unit had dirty connecters on the cat type plug. I cleaned that and the light came on by the antenna on the remote-control box (I still have no FOB). on the DS there is a rocker switch next to the sewar head in the storage box that doesn't work. it has 5 wires, 2 small white, black, red and green. there is 12volt across the 2 small white wires but no voltage on any others. the 2 small white wires go to a small round white tube on the front of the sewar hose head storage box. I don't know what that is.
   
Here is the sewer hose air extension / retraction valve (I think)
   
I don't know why the wire is wrapped around it.

I am looking for a replacement FOB or a complete remote unit.
I would like a wiring diagram if anyone has one.
I would also like a function diagram of the retract / extend system if there is one out there.