As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A SOUR/MUSTY ODOR WAS OBSERVED IN THE CABIN DURING DESCENT AT 6,000 FEET. THE ODOR STOPPED AFTER LANDING. MAINTENANCE FOUND THE RT ACM LEAKING. THE RT ACM WAS REMOVED AND REPLACED IAW MM 21-51-1,. OPERATIONAL CHECKS WERE GOOD WITH NO LEAKS NOTED.