As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAIL ROTOR GEARBOX DISASSEMBLED FOLLOWING CHIP LIGHT INDICATION. FOUND OUTPUT SHAFT DUPLEX BEARING SET BAD. INNER RACE OF BEARING SEVERELY GALLED AND FLAKING. SUBMITTER STATED THIS WAS THE SECOND OCCURRENCE OF THIS TYPE FAILURE WITHIN 600 HOURS, AND 17 MONTHS. EXXON 2380 OIL USED.