Call the Lippert customer service...they are very good at trouble-shooting over the phone. If possible, have access to your trailer because they will want you to try various tests to narrow things down. I just went through this..."right rear jack" failure. the jack wouldn't move. Unplugged the power terminal at the jack, attached a 12v battery to the 2 leads and nothing happened...something went wrong in the motor. Had to replace the motor.
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