I have the same model (3791RD) but 2019 model year. Mine are Schwintek slides in the living room, so I assume yours are as well. Do the motors activate when trying to extend the slide? Can you hear it run or does it not do anything? It could be the extend circuit is not getting power. I had a bad switch on my hydraulic dining room slide. Tech said it was the reversing solenoid, but the other slide and landing gear worked fine. You can reverse the wires on the back of the switch (extend and retract) to test if that is the case.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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