Hello, I have recently come to a facility that has a Durst L184 enlarger. I tried using it and everything works, except the enlarger head will not move up or down. It does have a motor to move the head, and I have check all the wiring and nothing seems to be unplugged or what not. When I press the button on the remote to signal the enlarger head the motor runs but nothing moves. I was wondering if anyone could give me some advice on how to fix this problem. I am a student and no one in the facility I am using know anything about this beautiful beast, no one has used it in a long time and was a gift to the facility. Please help me fix this enlarger, thank you!