As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELECTRICAL BURNING ODOR STARTED IN THE AFT CABIN AREA. INSPECTED ACFT FOR ELECTRICAL BURNING ODOR. CHECKED AFT CARGO LIGHTS FOR BURNING ELECTRICAL ODOR, NO ELECTRICAL BURNING ODOR NOTICED. FOUND MAPCO SOCKET WITH BURN EVIDENCE PRESENT. R & R MAPCO SOCKET. APPLIED POWER TO MAPCO SOCKET, NO BURNING ODOR PRESENT. NO FURTHER DEFECTS NOTED. RETURNED TO SERVICE.