What was found
FA'S REPORTED AN ODOR DURING DESCENT, IN THE BACK OF THE CABIN AND FRONT. WHEN PACK WERE SELECTED OFF IT SEEMS TO DISSAPATE. PERFORMED OPS TEST OF PACK SYSTEMS 1 & 2, WITH APU, ODOR DETECTED. GVI OF APU SHOWS LEAK AROUND LOP DRIPPINS ONTO AIR DUCT. CLEANED AS REQUIRED. PERFORMED ENGINE 1&2 RUN WITH BLEEDS 1&2 + PACK 1+2, NO SMELL DETECTED W/ OUT APU. ALL PER AMM 49-90-00-600-004-A/49-00-00-710-008-A/71-00-00-710-043-A/-047-A, CHECKS OK NO ODOR IN SYS 1 OR 2 W/ OUT APU