As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3121 - AFTER RELEASING PARK BRAKE FOR PUSH BACK, BRAKE PRESSURE STAYED AT 500 PSI BOTH SIDES. BRAKES WOULD NOT RELEASE FULLY IN A TIMELY MANNER, WOULD PARTIALLY RELEASE. CORRECTIVE ACTION: R/R PARKING BRAKE CONTROL VALVE PER A319 AMM 32-45-51 OPS AND LEAK CHECK OK.(7937472)