As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACKS SMELL MUSTY. FOUL ODOR ON DESCENT WHEN POWER REDUCES TO IDLE THROUGHOUT CABIN. OPERATED PACKS AT FULL HIGH FULL HEAT SMELL BARELY NOTICEABLE, SUSPECT AIR FILTER CHANGE NEEDED PCN (110-2288) - (QTY 2 EACH). REPLACED BOTH FILTERS. RAN BOTH PACKS NO SMELL NOTED.