As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT SMELLED BURNING OIL IN CABIN, TURNED OFF CABIN HEAT AND SMELL WENT AWAY. INSPECTION FOUND MUFFLER CRACKED AT TAILPIPE ABOUT 3/4 AROUND TAILPIPE TO MUFFLER. MUFFLER WAS A NEW REPLACEMENT FROM AEROSPACE WELDING INSTALLED ON 4/13/3018 3125.8 TACH, REMOVED 3/25/2019 3757.1 TACH. CRACKED MUFFLER WAS RETURNED TO AEROSPACE WELDING.