If the problem is just in the door operator itself, there may be hope. The ISIS systems used an ECI 2000 operator. It's successor is the GAL MOVFE-HL. Spare parts should be available from GAL (ECI's successor). If it has been rendered obsolete, GAL will provide you with a 2000-MOVFE upgrade kit which will only require you to change out the controller and possibly the motor/encoder as well. If the issue is in the TKE control system, you might be out of luck.
