troubleshoot GBC 2260X shredder "door open" indication remains on regarless of door switch being closed. The switch works properly. This problem is in the circuitry. Need circuit diagram. Need list of local repair shops for same. Paid for help on Fixya but the site does not allow me to keep going past a certain point with the problem not solved. Anyone out there had this problem with the 2260X shredder?