As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING BOARDING REAR FA REPORTED ELECTRICAL BURNING ODOR COMING FROM VENTS. PERFORMED SYSTEM INSPECTIONS IAW FIM 21-00 TASK 830 PARA I (ELECTRICAL FAULTS) INCLUDING ENGINE AND APU RUNS FOR AIRBORNE ODORS, NO DEFECTS FOUND. AC OKAY FOR SERVICE.