As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING AN OVERHAUL IT WAS FOUND THAT AN OIL PASSAGE WAS MISSING IN THE GEARBOX HOUSING BEARING BORE OF THE INPUT SHAFT DUPLEX BEARING. AFTER INVESTIGATION, IT WAS DETERMINED THAT ALL A/C FROM A/C S/N 53392 ARE AFFECTED AS ARE ALL SPARES SHIPPED SINCE AUGUST 1999.