What was found
ON DESCENT, LANDING, AND TAXI IN, STRONG CHEMICAL SMELL FROM THE LAST TWO PASSENGER ROWS, AND STRONGEST IN THE AFT GALLEY BETWEEN THE TWO AFT LAVS. ODOR STILL PRESENT EVEN AFTER PASSENGERS DEPLANED. PER J/C 26L00021001 FOUND APU TO BE SOURCE OF ODOR, APU AREA SATURATED IN OIL. R&R OIL COOLER IAW AMM 49-91-44. THE AIRCRAFT WAS GROUNDED.