As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
POSSIBLE FUME EVENT DURING INITIAL DESCENT. AT FA REPORTED MUSTY SMELL PAST NOW 30. APPLIED SUPPLEMENT PROCEDURE IAW 3.226.1 AND SMELL WENT AWAY. -PERFORMED THE LEVEL A DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM (ECS) AS PER AMM 21-00-00. NO FAULTS NOTED DURING APU, ENGINE 1 OR ENGINE 2 OPERATION ISOLATING PACK 1 / PACK2. A/C OK FON CONTINUED SERVICE.