As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, TROUGH 14.000 FT AT IDLE THRUST A MUSTY ODOR WAS NOTICED ON THE FLIGHT DECK. PACK 1 WAS TURNED OFF AN ODOR WENT AWAY. ODOR WAS NOT NOTICED IN THE CABIN OR ANY OTHER TIME DURING FLIGHT OR GROUND OPS. PACK BURNOUT PROCEDURE IAW AMM 21-00-00. OPS CHECK GOOD NO UNUSUAL ODOR NOTED.