What was found
DURING DESCENT, TURNED OFF PACKS 1 & 2 UNDER 10,000FT, ENGAGED PACK 1 & 2 AT 3000 FT. ODOR IN COCPIT AND CABIN. TURNED OFF PACK 1 & 2 FOR LANDING. PERFORMED TSM 21-00-00-810-801-1, 71-00-00-810-801A, & 21-00-00-810-802-A. PERFORMED BORESCOPE INSPECTION IAW TSM 71-00-00-810-A, & AMM 72-00-00-200-017B, NO DEFECTS NOTED. PERFORMED TSM 21-00-00-810-801-1, 71-00-00-810-801A, & 21-00-00-810-802-A AND FOUND THE NR 1 PACK TO BE HAVE AN ODOR. THE NR 1 PACK AIR PLENUM CHAMBER WAS FOUND DAMAGED. REMOVED & REPLACED THE NR 1 PACK AIR PLENUM CHAMBER IAW AMM 21-52-22. ALL CHECKED GOOD. FOUND CONTAMINATION ON THE NR 1 PACK ACM. REMOVED & REPLACED THE ACM IAW AMM 21-52-21. ALL CHECKED GOOD.