What was found
AFTER PUSHBACK AND ENGINE START AFT FA'S CALLED TO REPORT AN ELECTRICAL BURNING SMELL. NO VISIBLE SMOKE OR FIRE REPORTED. PASSENGER IN 29DEF ALSO REPORTED THE ODOR. WALK AFT NOTICED THE SMELL BEGINNING AROUND ROW 15. AND A STRONGER ODOR IN THE AFT GALLEY NEAR 2L DOOR. ALSO ROW 16 SEAT D OUTLET STATUS LIGHT RED. C/A: PERFORMED NOGO ODI TASK 2172. FOUND COFFEE MAKER 509 WITH EXPOSED WIRE. COFFEE MAKER BURNT, CAPTAIN CONFIRMED. COFFEE MAKER PLACED ON NEF WITH C/B PULLED AND COLLARED. OK TO CONTINUE SERVICE. (LP: 8863470) AIRCRAFT WAS GROUNDED.