Welcome to the club. Open or closed?
Assuming that the coach has power, the likeliest culprit is lack of lubrication. Lube the heck out of all the joints. Underneath, the motor (from a Taurus power window) drives a gear that rotates a shaft. The shaft bushings should be well lubed, and any moving junctions you can find.
Another possibility is that the gear has stripped (usually due to stepping on the steps while they are still in motion). In that case, you need a new motor.
Then there are fuse and electrical issues. I can't speak to those well, but someone will come along soon.
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2022 Newmar Ventana 3717
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