What was found
AIRCRAFT WAS GROUNDED: ELECTRICAL SMELL FROM ROWS 19-20 DESCRIBED AS PLASTIC BURNING SMELL AND PERSISTENT FROM MULTIPLE PEOPLE. COULD NOT ISOLATED INCLUDING TURNING OFF AND OUT ALL ELECTRICAL DEVICES. SOURCE IDENTIFIED TO 19F, REMOVED AND REPLACED POWERPORTS AT SEATS 19ABC (AALA202603312668), 19DEF (AALA202603316791), 20ABC (AALA202603315039), AND 20DEF (AALA202603318454). PER AMM 23-81-04.