As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) NR 3 AND NR 4 ENGINE THRUST REVERSERS FAILED TO OPERATE. SUSPECT CAUSED BY FROZEN LINE TO PILOT VALVE. LOCAL TEMPERATURE WAS 15 DEGREES F (-9.5 DEGREES C). BOTH THRUST REVERSERS OPERATED SATISFACTORY FOLLOWING HEATING AND RECYCLING OF CIRCUIT BREAKER. NR 1 ENGINE THRUST REVERSER WAS ALREADY LOCKED OUT.