As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAXI PRIOR TO T/O, AN OIL ODOR WAS PRESENT IN THE CABIN. THE ACFT RETURNED TO THE RAMP AND THE FLIGHT WAS CANCELLED. BORESCOPE INSP FOUND FRESH OIL IN THE HP IMPELLER. MFG WILL INVESTIGATE TO ESTABLISH ROOT CAUSE AND SUPPLEMENT THE REPORT ONCE THE INFORMATION IS AVAILABLE.