What was found
DISTINCT EXHAUST ODOR IN COCKPIT AT TAKE OFF WITH APU ON AND APU BLEED AIR ON. WITH BLEED AIR OFF THE ODOR IS REDUCED. IN FLIGHT THERE IS AN EXHAUST ODOR (NOT AS DISTINCT). IT IS REDUCED WHEN EITHER PRESS SOURCE IS SELECTED. FOUND APU OIL OVERSERVICED. REMOVED OIL TO CORRECT LEVEL. IAW MM 12-11-03. INSPECTED WATER SEPARATOR/ COALESCER SOCK FOUND RESIDUAL OIL & DIRTY ODOR. REPLACED SOCK "NEW". MX IAW MM 21-51-00. FOUND APU FLOW DIVIDER TEE B-NUT - LEAKING FUEL AT APU PRIMARY FUEL MANIFOLD. TIGHTENED B-NUT. MX IAW MM 49-30-06, OPS CHECK GOOD.