As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD F/A REPORTED A BURNING SMELL SIMILAR TO A RAG BURNING IN FIRST CLASS. MX COMPLIED WITH TROUBLESHOOTING CABIN ODOR 737, JOB CARD 03L00021001. R & R RECIRCULATION FAN HEPA FILTERS IAW AMM 21-21-23-404-059 AND AMM 21-21-23-004-055.