I have a Bang & Olfusen beosystem 2500, I'm having problems with the automatic doors. My doors open fully, but don't close fully. They close about 1/3 of the way, leaving a gap of about 2 1/2 inches. Anybody have any Idea's whats wrong, and how to fix. I'm thinking gears, and bands might be streched or worn. I don't have a service