As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RADIO RACK FAN EXHAUST DUCT EXHIBITS SIGNS OF FIRE AND OVERHEATING, INSULATION BLANKETS AND FOAM MATERIAL FROM INSIDE OF DUCT BELOW MAIN CABIN FLOORING AT BS 475 THRU BS 495. R&R DUCT ASSY, BLACK FOAM DETERIORATED. INSPECTION FOUND NO EVIDENCE OF FIRE.