As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)PILOT REPORTED NOISE AND THEN FUMES AND FUEL SMELL IN COCKPIT. INVESTIGATION FOUND THE JANITROL HEATER HAD A SMALL PUNCTURE IN THE LOWER END PLATE. THE EDGES WERE FOUND BURNT. SUBMITTER RECOMMENDS A GOOD VISUAL INSPECTION ANNUALLY.