As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAINTENANCE PERSONNEL DETECTED BLEED AIR LEAK IN TAILCONE DURING GROUND OPERATION. TRACED SOURCE TO CENTER MATING SURFACES OF WINDSHIELD ANTI-ICE SHUTOFF VALVE. REPLACED VALVE WITH OVERHAULED UNIT. PROBABLE CAUSE: BLOWN GASKET IN VALVE.