As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GNDED. AFTER STOPPING AT THE GATE, ENGS OFF, MAIN BRAKES SET, RUDDER PEDALS FULL DEPRESSED WOULDN'T KEEP THE ACFT FROM ROLLING BACK. PARKING BRAKE ENGAGED TO STOP ACFT. GOOD PSI ON TRIPLE INDICATOR. PERFORMED OPERATIONAL TEST OF NORMAL BRAKING IAW AMM 32-40-00-710-001A & ALT BRAKING TEST OK IAW AMM 32-43-00-710-001A. SERVICED BRAKE ACCUMULATOR IAW AMM 32-44-11-200-001-A. TESTED OK.