As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHUTDOWN OF NR 4 ENGINE DUE TO SUSPECTED DECOUPLE APPROX 30 MIN. AFTER TAKEOFF FROM LCK. RETURNED TO LCK AND LANDED WITHOUT INCIDENT. FOUND NO DECOUPLE CONDITION, NR 4 PROPELLER VALVE HOUSING ASS'Y HAD FAILED BEARING. REPLACED NR 4 PROP AND VALVE HOUSING ASS'Y AND FUNCTIONAL CHECKED PER SAT J/C 6101, 7101 AND 7101-2 AND RETURNED TO SERVICE.