As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT RECEIVED A TAIL ROTOR GEARBOX CHIP LIGHT UPON ENGINE START UP THAT COULD NOT BE CLEARED USING CHIP PULSE. LIGHT ILLUMINATED BEFORE TAKEOFF WAS INITIATED AND BOTH ENGINES WERE SHUTDOWN NORMALLY. UPON INSPECTION, FOUND T/R GREARBOX CHIP DETECTOR TO HAVE MULTIPLE LARGE OBJECTS OF DEBRIS ATTACHED. AFTER REFERRING MM, FOUND DEBRIS SIZE AND SHAPE CATEGORY TO WARRANT GEARBOX REPLACEMENT DUE TO LIKELY GEAR WEAR. REPLACED GEARBOX ASSY ON ACFT WITH SERVICEABLE ASSY.