The first thing I would do would be to isolate the motor and confirm it still functions. I would also disconnect the activation arms and ensure each arm mount/rotating assembly is not seized. To me, slowly slowing down and then stopping means some component has frozen and the motor can no longer overpower it.
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The Nilsons
2003 Tradewinds LTC, Dynomax Chassis,
350 Cummins, 2008 Lexus RX400h, 18' PJ Trailer
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