What was found
(CAN) WHILE PUSHING THE AIRCRAFT WITH A TUG THE LT BRAKE LOCKED UP. ON INSPECTION IT WAS DISCOVERED THAT ONE OF THE STATOR DISKS HAD BROKEN AND JAMMED THE BRAKE. THE BRAKE WAS REPLACED WITH AN OVERHAULED UNIT. AD2004-09-05 WHICH ADDRESSES MFG BRAKE STATORS BREAKING HAD BEEN ACCOMPLISHED RECENTLY AND PASSED THE INSPECTION AS CALLED OUT. BOTH STATORS ARE STAMPED 'CHANGE D', SO NO FURTHER ACTION WAS REQUIRED. IN LIGHT OF THIS INCIDENT THE REPLACEMENT CRITERIA SHOULD POSSIBLY BE CHANGED.