As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT THRUST UNLATCHED MASTER CAUTION IN FLIGHT, COMPLIED WITH QRH. EMERGENCY DECLARED AND ACFT RETURNED TO DEPARTURE. R & R RT ENGINE THRUST REVERSER PDU. RT ENGINE THRUST REVERSER OP CHECKED GOOD IAW AMM 78-32-03. NO FURTHER DEFECTS NOTED.