What was found
LOUD NOISE IN AFT GALLEY WITH APU AIR SELECTED ON(<P>PERFORMED DVI AND APU BLEED LEAK TEST IAW AMM 36-11-00, NO DEFECTS. REMOVED, INSPECTED, REINSTALLED APU BLEED CHECK VALVE IAW AMM 36-11-11, NO DEFECTS. INSPECTED APU AIR SUPPLY VALVE AND OPS TEST IAW AMM 36-11-10, NO DEFECTS. OPS CHECKED APU AIR ON AND OFF SEVERAL TIMES, COULD NOT DUPLICATE LOUD NOISE, APU BLEED AIR OK PER AMM 49-52-00.<BR /></P>)