What was found
FUME EVENT SHORTLY AFTER THRUST REDUCTION DURING CLIMB. TURNING OFF PACK 1 AND CLOSING THE CROSSBLEED SEEMED TO IMPROVE THE SITUATION. FOUND APU LOP SWITCH LOOSE. TIGHENED IAW AMM 49-94-14. REMOVED & REINSTALLED THE APU BLEED DUCT IAW AMM 49-11-11. FOUND CONTAMINATION, CLEANED AS NECESSARY. PERFORMED A NR 1 ENGINE RUN IAW AMM 71-00-00 FOR 25 MINS. NO ODOR NOTED IN THE NR 1 OR 2 PACKS. PERFORMED APU OPS CHECK FOR ADDITIONAL 15 MINS IAW AMM 49-00-00. NO ODOR NOTED. R & R THE RECIRCULATION FILTERS IAW 21-21-41. NO FURTHER ODORS AT THIS TIME.