As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, ACFT HAS A SMELL SIMILAR TO PLASTIC MELTING IN OVEN. SEEMS TO WORSEN WITH POWER INCREASE. PERFORMED NR 2 ENG WASH. REPLACED LT & RT RECIRCULATION FILTERS. PERFORMED HIGH POWER ENG RUN TO BURN OUT SMELL IAW JRH-2-40-35. NO ODOR AT THIS TIME.