As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AC DIVERTED ON REPOSITION LEG FOR OILY ODOR IN CABIN WHEN TEMPERATURE WAS TURNED TO HOT. WITH TEMPERATURE TURNED DOWN, THE ODOR DISAPPEARED. MAINT RAN THE AC WITH TEMPERATURE IN FULL HOT AND FULL COLD. NO OILY ODOR WAS NOTICED. CABIN AIR OUTLETS WERE CHECKED FOR BLOCKAGE. TEMPERATURE SENSOR WAS CHECKED FOR PROPER OPERATION. THE DISCREPANCY COULD NOT BE DUPLICATED.