The schwintek motors utilize an extremely small sized wire that has zero strain relief/support where it exits the motor and runs down the inner slide seal. When completely extended the room frame smashes the wiring harness right at the top where the wiring harness exits the motor. It is one of the more common repairs on these. With the room open, if you can reach in behind, pull the seal loose (it just snaps in place) from the top about 12" and inspect the wiring harness connecting that motor. I think you'll find it's been pinched and probably chafed right there.
94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified