As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT CREW SMELLED SULPHUR ODOR IN ACFT. UPON DEBARKATION OF PASSENGERS, CABIN FILLED WITH SMOKE, STARTING FROM THE REAR OF THE ACFT. ON INSPECTION OF A/C PACKS, IT APPEARS BOTH "ACM OIL RESERVOIRS" WERE BLACK - WHICH AT THE BEGINNING OF THE FLIGHT WAS NOT THE CASE. REMOVED CABIN ACM AND INSTALLED A REPAIRED UNIT. OPS CHECKED GOOD. WORK PERFORMED IAW MM 21-51-00.