As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEATER BLOWS SMOKE ( CORRECTIVE ACTION ) PREFORMED DETAILED INSPECTION OF HEATER BLEED AIR SYSTEM. FOUND TRACES OF OIL IN LINES. FLUSHED BLEED AIR LINES. PREFORMED OPERATION CHECK OF HEATER SYSTEM. NO DEFECTS NOTED. AIRCRAFT IS APPROVED FOR RETURN TO SERVICE.