What was found
MAIN DECK CARGO SMOKE CAME ON DURING CLIMBOUT. RETURNED, LANDED, F/O SMELLED ODOR JUST PRIOR TO MAIN DECK CARGO SMOKE INDICATION AND THE SCENT DISAPPEARED AFTER NR 2 PACK WAS TURNED OFF. FOUND OIL ON BOTH PACK COALESCER BAGS. OIL LEAK AT APU BEING INJESTED INTO APU INLET. FOUND APU LOW OIL PRESSURE FLEX HOSE LEAKING. MPN 399-506-9010, CPN 4911201, QTY 1 HOSE, MSN 930258.