As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON TAXI IN WHEN PARKING BRAKE RELEASED TRIPPLE INDICATOR SHOWED 250 PSI LEFT BRAKE PRESSURE AND LEFT BRAKE DRAGGED UNTIL LEFT BRAKE PEDAL DEPRESSED AND RELEASED. MAINTENANCE REPLACED THE LEFT #1 BRAKE ASSEMBLY PER AMM 32-42-27 (AALA202303222925) AND THE #1 NORMAL BRAKE SAFETY VALVE PER AMM 32-42-36 (AALA202303224221). THE BRAKE SYSTEM WAS BLED AND A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.