As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI/GROUND HANDLING THE CREW ATTEMPTED TO ENGAGE THE PARKING BRAKE. CREW RETURNED TO GATE UNEVENTFULLY AND PASSENGERS WERE DEPLANED NORMALLY. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE PARKING BRAKE HANDLE ROLL PIN. A SATISFACTORY OPERATIONAL CHECK WAS PERFORMED AND AIRCRAFT WAS RELEASED FOR CONTINUED SERVICE.