As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT DIVERTED, AFTER THE CABIN CREW REPORTED AN INTERMITTENT BURNING ODOR. MX COULD NOT FIND ANY POSITIVE SOURCE FOR THE ODOR. THE RT ACM WAS REPLACED DUE TO SUSPECTED OVERTEMP. A DUCT BURNOUT WAS ACCOMPLISHED AND THE ACFT HAS RETURNED TO SERVICE.