As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELECTRICAL BURNING ODOR AT ROW 4 AND 5 A/C. INSPECTED AREA UNDER PSU'S IN ROWS 4 AND 5 ALL WIRING SHOWED NO SIGNS INDICATION OF HEAT DAMAGE. RAN BOTH ENGINES WITH BLEEDS ON CND. COMPLIED WITH HIDDEN DAMAGE INSPECTION, NO DEFECTS NOTED.