As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RMS - FLT ADT4 - DURING FLIGHT, NR 1 ENGINE REDUCTION GEARBOX FAILED. SHUT DOWN NR 1 ENGINE AND LANDED SAFELY. FOUND METAL IN MAG PLUGS AT REDUCTION GEARBOX. REPLACED NR 1 ENGINE AND PROPELLER PER J/C 7103, 6101. PERFORMED ENGINE RUN-UP, SYSTEM OPS CHECKED GOOD. (X)