What was found
CREW STATED THE ODOR SMELLED LIKE A BURNING CIRCUIT BOARD. IT WAS VERY STRONG AROUND ROWS 24,25,26,27 AND RIGHT BEFORE FWD AFT LAV PAX IN THIS AREA ALL SMELLED THIS ODOR. ONE PAX WAS A THROUGH TRIP PAX AND SMELLED THIS ON LANDING WITH THIS SAME AIRCRAFT IN THE BACK ROWS . REF LOG 1 AFT LAV LIGHT ASSY FOUND BROKEN SOCKET. ALSO RAN BOTH ENGS AND APU, ISOLATED PACKS, NO SMELL NOTED.