As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOI ON FLIGHT 2447- VERY NOTICEABLE MUSTY FOUL ODOR THROUGHOUT CABIN AND COCKPIT. DISSIPATES IN ABOUT FIVE MINUTES AFTER APU SHUTDOWN. RETURNS WITH APU START UP. ALSO NOTED SMELL IN DESCENT FROM 10,000 TO GROUND. OPERATED AIRCRAFT WITH APU AIR WITHOUT ENGINES RUNNING. NO UNUSUAL ODOR NOTED. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.