What was found
VERY STRONG ODOR COMING THROUGH AIRCRAFT THAT SMELLS SLIGHTLY LIKE OIL. SMELL SEEMS TO BE STRONGER WHEN USING THE COCKPIT PACK. PLACED ON MEL, REF 49-2. PRIOR TO RETURNING AIRCRAFT TO SERVICE, TROUBLESHOT TO APU AIR. GROUND RAN NR 1 AND NR 2 ENGINES AT 85 PERCENT FOR 30 MIN, SMELL CLEARED. MEL CLEARED ON 4-8-97 BY INSPECTING APU FOR SMOKE SMELL, NO DEFECTS NOTED. INSPECTED COCKPIT PACK, CHECKS GOOD. INSPECTED CABIN PACK, FOUND ACM TO BE OVERSERVICED. ADJUSTED OIL LEVEL IN ACM, AND REPLACED WATER SOCK.