As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO GATE WITH AN OVEN FIRE. REPLACED OVEN. REMOVED OVEN WAS DISASSEMBLED AND A SMALL DEPOSIT OF SOLIDIFIED PLASTIC WAS FOUND ADHERING TO UPPER SURFACE OF OVEN UPPER INTERNAL BAFFLE PLATE CLOSEST TO FAN MOTOR AND BURNER ELEMENTS. IDENTIFICATION OF SOURCE OF PLASTIC IS UNKNOWN. NO DEFECTS IN OVEN PROPER.