What was found
DURING CRUISE, FLIGHT ATTENDANTS REPORTED SMELL OF BURNING INSULATION IN LAST 8 ROWS OF COACH CLASS. IFE & PAX SEAT SWITCH TURNED OFF. FOUND THE OUTLET ON SEAT 23E TO BE BAD OR INOPERATIVE. OPERATED PACKS HOT & COLD USING ENGS, THEN APU. UNABLE TO LOCATE ANY OTHER CAUSE, UNABLE TO RECREATE ODOR. R & R ISPS AT SEAT ROW 23 DEF. POWER PORTS AT SEATS 23 DEF OPERATIONAL CHECKED OK IAW AMM 23-81-05.