As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS DETECTED A DIRTY SOCK ODOR WHILE PASSING THROUGH 7500 - 5000 FT DURING DESCENT. ODOR SEEMED STRONGEST IN THE COCKPIT. NR 1 ENGINE CHANGE ACCOMPLISHED IAW W/O 847556. R & R THE OZONE FILTERS 1 & 2. NO LEAKS NOTED IAW MM 21-51-41. ACCOMPLISHED A PACK BURNOUT IAW MM 21-00-00-615-001. ACFT OK FOR SERVICE.