As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OIL PUMP IMPELLERS S1B 524, FOUND OIL PUMP GEARS TO BE STEEL TYPE BUT NO DOCUMENTATION AS TO WHAT PN THE GEARS WERE. FOUND GEARS HAD FOREIGN MATERIAL HAD PASSED THROUGH THE OIL PUMP. OIL PUMP GEARS WERE NOT AIRWORTHY REGARDLESS OF PART NUMBERS. INSTALLED IMPELLER KIT PN 05K19423S. (ATTACHED PHOTOS)