As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE INSPECTION OF NR 1 THRUST REVERSER, MX FOUND THE THRUST REVERSER NOT STOWING. FURTHER INSPECTION FOUND UPPER BALLSCREW ACTUATOR AT FAULT WITH THE BOLTS AT THE GIMBAL SHEARED. PEFORMED A DETAILED INSPECTION OF THE REVERSER HALF IN QUESTION INCLUDING REVERSER CONE BRAKE FUNCTIONAL CHECK, IAW AMM 78-31-00, REMOVED THE DAMAGED UPPER ANGLE GEARBOX BALLSCREW ACTUATOR JACKSCREW AND REPLACED IT WITH THE LOWER BALLSCREW ACTUATOR.