What was found
OIL ODOR THROUGHOUT CABIN & COCKPIT ON ACFT ENTRY. APU LEAK CHK & INSP FOR CONTAMINATION C/W ON LOG 8044937, COMPLETES SMOKE AND FUMES WORKCARD 0550-2002 AND 0550- 2001 AND DUE TO PREVIOUS HIS ON NR 2 ENG. COMPLETED ENG 1 & 2 BOROSCOPE WORKCARD 7900-2001. REINSPECTED APU BAY & FOUND OIL CONTAMINATION IN PLENUM. C/W WORKCARD 2100-2005 ECS DECONTAMINATION REVERSE DUCT PROCEDURES. PERFORMED LVL A & LVL B ECS REMOVAL CONTAMINATION IAW AMM 21-00-00-615-802A/803A WITH SNIFFER. ODOR FAINTLY REMAINS WITH SNIFFER REACHING 80K. R & R RECIRC FILTERS IAW AMM 21-21 & AVIONICS VENT FILTER IAW AMM 21-26. PERFORMED LVL A & LVL B ECS DECONTAMINATION AGAIN IAW AMM 21-00-00-615-802A/803A. NO ODOR PRESENT, SNIFFER READING 30K. (LP: 8044936) AIRCRAFT GROUNDED.