What was found
DESCENDING THROUGH 10,000 FT , FA REPORTED MUSKY / CHEMICAL SMELL COMING OUT OF VENTS IN THE BACK 5 ROWS . LASTED 5 MINS, & DISAPATED. NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED.-REF TSM 05-50-00-810-831-A PERFORMED FAULT ISOLATION OF APU , ENG 1 & ENG 2 ODOR WITH PACKS 1 & 2. NO ODOR NOTED WITH APU OR ENGINE BLEED. PERFORMED GVI OF A/C EXTERIOR NO FAULT NOTED. A/C OK FOR SVC.