As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG ODOR OF BURNING/MELTING PLASTIC THOUGHT OUT THE CABIN LAST 10 MIN OF FLIGHT.// COMPLIED WITH TSM 05-50-00-810-831-A. RAN PACK ON ENG 1 ENG 2 AND APU SEPARATELY. CONFIRMED WITH HA MAINTENANCE CONTROL. NO SMELL RE-PRODUCIBLE THRU SUGGESTED PROCEDURES.