What was found
FUME EVENT IN CRUISE SMELLED BY FA'S AND PILOTS. RAN COM PROCEDURE FOR FUMES AND ISOLATED SYS #1 BY SHUTTING CROSSBLEED. CONDITIONS IMPROVED AND BLED #2 SUSPECTED AS POSSIBLE SOURCE. FUME EVENT CAME BACK DURING DESCENT. FOLLOWED COM PROCEDURES DESCENDED BELOW 10,000FT FOR RAT AIR VENT AND LANDED.-FOUND SOURCE OF CONTAMINATION APU OVERSERVICED. DRAINED APU OIL TO PROPER LEVEL IAW AMM 49-90-00. PERFORMED LEVEL C DECONTAMINATION OF THE ECS PACKS 1 AND 2 IAW AMM 21-00-00. NO FUMES. A/C OK FOR CONTINUED SVC