As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, THE PILOT REPORTED THE SMELL OF SMOKE, THE PILOT WAS UNABLE TO LOCATE SOURCE OF THE SMOKE SMELL & RETURNED & LANDED WITHOUT INCIDENT. INSPECTION REVEALED THREE BOXES IN D BAY WITH MELTED PLASTIC LABELS ON THE BLEED AIR DUCT WAS THE CAUSE OF THE SMOKE SMELL.