What was found
CREW REPORTED POSSIBLE BURNING ODOR IN THE VICINITY OF ROW 30 THRU 33, TURNED OFF THE OVERHEAD LIGHTS SEEMED TO ALLEVIATE THE PROBLEM. WITH IFE SWITCH OFF, BURNING ODOR STILL PRESENT BUT NOT AS STRONG, WITH GASPER FAN OFF, ODOR WORSE. FOUND BATTERY CHARGER M733 WARMER THAN OTHER CHARGERS. NO BURNED ODOR NOTED. REPLACED AS A PRECAUTION. CHECKED SDU, RF UNIT, APU BATTERY AND CHARGER, ALL OKAY.