As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AFTER TURNING ON RT RECIR FAN UNUSUAL ODOR FILLED THE COCKPIT AND FIRST CLASS CABIN. NOT AS BAD IN FIRST CLASS, SMELL LIKE OZONE OR ELECTRIC BURNING SMELL. ODOR COULD NOT BE DUPLICATED ON GROUND. SINCE IT WAS REPORTED THAT THE ODOR WAS LIKE OZONE, THE LT OZONE CONVERTER WAS REPLACED. THE OZONE CONVERTER WAS THEN ROUTED TO HONEYWELL FOR EFFICIENCY TEST. THIS MRR WILL BE UPDATED WITH TEST RESULTS AS SOON AS THEY BECOME AVAILABLE.