As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3306 AFTER PARKING AT GATE, THE PARKING BRAKE HANDLE WAS MOVED TO THE ON POSITION. PARKING BRAKE WOULD NOT SET. BRAKES HELD MANUALLY UNTIL AIRCRAFT CHOKED. CORRECTIVE ACTION: TESTED BOTH BSCU. NO FAULTS. BOTH TEST GOOD. PARKING BRAKE CYCLED SEVERAL TIMES CKS GOOD. (4940600)