As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE WAS REMOVED FROM SERVICE DUE TO CHIP LIGHTS AND AN AUDIBLE WHINE HEARD OVER THE RUNNING AIRCRAFT. THIS GEARBOX WAS ASSEMBLED IN-HOUSE AFTER A 3500 HOUR OVERHAUL INSPECTION OF THE GEARS WAS PERFORMED AN AUTHORIZED REPAIR FACILITY. PTO GEAR SHOWED SIGNIFICANT WEAR ALONG WITH SPALLING ALONG THE DRIVEN SIDE. THE COAST-DOWN SIDE WAS NORMAL.