What was found
(CAN) DURING HEAVY MAINTENANCE, WASHER WAS FOUND CRACKED ON LT OTBD FLAP FITTING. IT WAS NOTED DURING WASHER REPLACEMENT IAW 27-51-23 THAT THE REMOVAL OF THE NUT WAS ABNORMALLY HIGH. DURING A WALK AROUND AFTER THE AIRPLANE HAD BEEN REPAINTED THE LT FITTING STUD WAS FOUND SHEARED. THE FITTING WAS REPLACED AND THE ACFT RETURNED TO SERVICE. FAILURE OF THE STUD IS BELIEVED TO BE CAUSED BY THE ABNORMALLY HIGH BREAKING TORQUE ON THE ASSOCIATED NUT.