As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGER COMPARTMENT EQUIPMENT: STRONG OILY ODOR IN CABIN, WHEN ENGINES RUNNING. MOST PRONOUNCED ON POWER REDUCTIONS AND LOW POWER SETTINGS NO SMOKE PRESENT. PERFORMED TC-68A-21-181006M, BOROSCOPED LH AND RH ENGINES AND BLEED DUCTS COMING OFF ENGINES FOR OIL OR OIL RESIDUE WITH NONE NOTED. LEAK CHECKS SATISFACTORY. WORK DONE IAW EMM 72-00-00. NO OTHER DEFECTS NOTED.