As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIR CONDITIONING PRESSURIZATION SYS IS EMITTING A STRONG, RANCID, CHEESE LIKE ODOR INTO THE CABIN. REMOVED THE COALESOR SOCKS FROM PACKS & CLEANED THE PACKS & WATER SEPARATOR. CLEANED AIR SUPPLY LINE FROM ACM TO PACKS ON BOTH SIDES. REMOVED ANY WATER FROM WATER SEPARATOR DRAIN LINES & OPS & LEAK CHECKED GOOD IAW MM 21-51-00.