As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE EXPERIENCED A THRUST REVERSER UNLOCK ECAM MESSAGE, NO ACFT BUFFETING. FOLLOWED THE FCOM PROCEDURES AND SHUTDOWN THE ENGINE. RETURNED TO DEPARTURE. DURING TROUBLESHOOTING FOUND 2 OF THE 4 MOUNT BOLT NUTS MISSING ON THE THRUST REVERSER HOOK LATCH. REPLACED THE THRUST REVERSER ASSY. ACFT RETURNED TO SERVICE.