What was found
DESCENDING BELOW 10000 FT, FA REPORTED A STRONG CHEMICAL ODOR IN THE AFT CABIN. ACCOMPLISHED GROUND RUNUP OF THE NR 1 ENGINE, OPERATING LT & RT PACKS SEPARATELY. OPS CHECKED GOOD. COMPLETED GROUND RUNUP OF NR 2 ENGINE. OPERATED LT & RT PACKS SEPARATELY. OPS CHECKED GOOD. USED APU BLEED AIR, RAN LT & RT PACKS SEPARATELY. OPS CHECKED GOOD. NO ODORS NOTED. CAPTAIN AND FIRST OFFICER WERE ON BOARD. NO ABNORMAL ODORS.