As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1569, CUN-LAX. FLIGHT DECK AND BOTH IN FLIGHT CREWMEMBERS REPORTED STRONG SMELL. FRONT OF CABIN FRIST 5 ROWS ELECTRICAL IN NATURE, COMPLIED WITH TSM 24-00-00-810-823-A. NO FAULTS NOR BURNING SMELL FOUND AT THIS TIME. RAN AIRCRAFT APU WITH PACKS FOR OVER AN HOUR. CHECKED FWD AVIONICS. NO FAULTS FOUND. A/C OK TO CONTINUE SERVICE.