As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED A CABIN ODOR. THE AIRCRAFT WAS GROUNDED. MAINTENANCE FOUND THE TRIM AIR VALVE BURNED AND HAS SOME CORROSION. DETERMINED THAT IT WAS THE CAUSE OF THE EVENT. REMOVED AND REPLACED THE TRIM AIR VALVE AND NO FURTHER ODORS WERE NOTED.