As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PARKING BRAKE FAILED TO HOLD ACFT IN PLACE AT THE GATE. PARK BRAKE ACCUMULATOR HANDLE IN ON POSITION, BRAKE PRESSURE ZERO ON TRIPLE INDICATOR. SERVICED YELLOW HYD SYS BRAKE ACCUMULATOR IAW AMM 12-14-32-616-002A. TRIPLE INDICATOR SHOWS 2000 PSI WITH PARKING BRAKE IN ON POSITION.