I learned today that the weights weigh more than the cab when the cab is empty. So the elevator if not "locked" in place would tend to drift upward and the weights move downward. It seems as if the elevator is not 'locking' in place for very long.

Is this a control board problem likely (electronic) or a mechanical problem (brake or locking mechanism)?

I am asking because this elevator (Garaventa bought Conquest) is not sold anymore and circuit boards may be impossible to get. I'm hoping I have a mechanical issue that can be fixed easily by any technician.