As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN DESCENT THRU FLT LEVEL 200 RT RECIRC FAN INOP, LIGHT ILLUMINATED WITH MSG, DETECTED FUMES IN CABIN. FOLLOWED CHECK LIST ODOR WENT AWAY. REMOVED FWD BB AFT WALL, PERFORMED VISUAL INSPECTION OF RT RECIRC FAN AND ASSOCIATED WIRING. REPLACED FAN.