As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING PLASTIC SMELL REPORTED BY F/A IN CABIN DURING FLIGHT. NO SMOKE NOTED.. REMOVED THERMOCOUPLE INSULATION OUT OF BOTH FWD ELECTRONIC COMPARTMENT INTERNAL RECIRCULATION FANS. FUNCTIONAL CHECK FLIGHT PASSED. AIRCRAFT RETURNED TO SERVICE. (K)