As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT AT FL 350 WE RECEIVED AN ''R REV UNLOCK'' MESSAGE. FOLLOWED MEMORY ITEMS AND THEN QRH. ENGINE WAS SHUT DOWN PER QRH. NORMAL SINGLE ENGINE LANDING WAS MADE. REMOVED AND REPLACED PDU IAW MM 78-32-03 AND RIGGED LOWER INBOARD BALLSCREW ACTUATORS IAW MM 78-32-03. OPS GOOD.