What was found
FUMES DURING DESCENT THROUGH 12,000 FT. SUSPECT THE NR 1 PACK. SHUT OFF THE NR 1 PACK, ODOR SEEMED TO DISSIPATE AT OR BELOW FL 370. PERFORMED DECONTAMINATION WITH APU ON NR 1 PACK IAW AMM 21-00-00-615-001-A. OPS CHECKED GOOD, NO ODOR NOTED. NR 1 PACK HAS BEEN REACTIVATED IAW AMM 21-51-00.