What was found
WHILE BEING VECTORED TO ITIWE ON THE RNAV 36 APPROACH INTO KHUM, PASSENGERS IN THE CABIN OF THE AIRCRAFT STARTED YELLING TO GET THE CREW'S ATTENTION ABOUT A STRONG BURNING ODOR. THE FLIGHT CREW CONFIRMED THE PRESENCE OF THE ELECTRICAL/PLASTIC BURNING SMELL. THE VELCRO BARRIER ON THE COVID CURTAIN WAS PULLED BACK TO BOTH ASSURE THE PASSENGERS THAT THE CREW WAS AWARE OF THE SITUATION AS WELL AS TO CONFIRM IF THERE WAS SMOKE IN THE CABIN OR NOT. NO SMOKE WAS VISIBLE TO THE CREW FROM THE COCKPIT. BOTH VENT FANS WERE PLACED TO THE OFF POSITION. NEITHER THE HEATER NOR AIR CONDITIONER WERE IN USE THROUGHOUT ANY PORTION OF THE FLIGHT, BOTH OUTBOUND AND INBOUND. THE CREW OPENED BOTH COCKPIT VENTILATION WINDOWS TO HELP CLEAR OUT THE SMELL AND CONTINUED THE RNAV 36 APPROACH TO AN UNEVENTFUL LANDING. NO EMERGENCY WAS DECLARED. TL-237604-2023 PERFORMED DETAILED INSPECTION OF ALL DC ELECTRICAL COMPONENTS IN CABIN AND COCKPIT OVERHEAD. INSPECTION FOUND AFT MOST PASSENGER ADVISORY LIGHT SHORTED AND BURNED.