As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED, DUE TO A BURNING ODOR NEAR ROW 22. CREW FOLLOWED QRH SMOKE AND FUME CHECKLIST, NO VISIBLE SMOKE WAS OBSERVED. DECISION WAS MADE TO DIVERT. YELLOW EMERGENCY WAS DECLARED. TROUBLESHOT SOURCE OF ODOR TO LT AIR CONDITIONING PACK OVERHEAT. PACK TEMP CONTROL WAS DEFERRED IAW MEL 21-51-01A-MSP. REPLACED LT ACM AND LT LOW LIMIT VALVE.