As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GNDED. ON TAKEOFF OIL BURNING SMELL TURNED OFF NR 1 PACK SMELL WENT AWAY. FOUND LT PACK REHEATER HAD MOLD & DIRTY MUSTY SMELL. REPLACED IT IAW AMM 21-52-31-400-001-A. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECKS WITH NO ODORS BEING NOTED.