As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN ROTOR TRANSMISSION WAS MAKING VERY SMALL AMOUNTS OF METAL, BUT ENOUGH TO KEEP SETTING OFF THE CHIP DETECTOR. STRAINED OIL AND FILTER LOOKED NORMAL. TEAR DOWN INSPECTION, FOUND BEVEL GEAR COMPLETELY CRACKED THROUGH. THERE WHERE NO OVER TORQUE INDICATIONS. UNKNOWN IF GEAR HAS MFG DEFECT? (IMPROPER HEAT TREATMENT?) THIS GEAR SHOULD NOT CRACK CLEAR THROUGH. NO MATTER HOW CLEAN YOUR FILTER BOWEL LOOKS OR HOW SMALL THE AMOUNT OF METAL FOUND, HEED YOUR MULTIPLE CHIP DETECTOR INDICATIONS AND INSPECT YOUR TRANSMISSION.