As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER START, WHEN BLEEDS SELECTED ON, OIL ODOR WAS NOTED IN THE REAR OF THE ACFT. AIRCRAFT COMMENCED TAXI AND ODOR DID NOT DISSIPATE. MINOR TROUBLESHOOTING WAS PERFORMED BY ISOLATING BLEEDS, WITHOUT IMPROVEMENT. ACFT RETURNED TO BAY AND SHUTDOWN NORMALLY. TROUBLESHOOTING ON-GOING.