As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE INSPECTION ON FLIGHT 9805 REPORTED AT FL 180 HAD BURNING PLASTIC SMELL WITH ICE DETECTION OVERRIDE. THE ACFT WAS REMOVED FROM SERVICE. COMPLIED WITH CW ETN-EM-72-034 FOR BURNING PLASTIC SMELL. DIDN'T SMELL ANYTHING THROUGHOUT CHECKS. INSPECTION OF AIR DISTRIBUTION DUCTS PCW ON NRWC 824-ORD-01559 NR 2 ACFT RELEASED FOR FCF PURPOSES ONLY. IAW NRWC 824-ORD-01560, THE AIRCRAFT RETURN TO SERVICE.