As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COCKPIT ODOR: NOTICED OIL SMELL THROUGH VENTS WITH APU BLEED AIR ON. WORSE IN THE COCKPIT THAN CABIN. CORRECTIVE ACTION; C/W NJA TC-C68A-21-181006MR3 ECS BLEED AND TRIM AIR DUCT BURN PROCEDURE. REPLACED HEPA FILTER IAW CE-680A MM-21-70-10. NO FURTHER SMELL NOTED AFTER REPLACING FILTER.