As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER NR 2 ENGINE START A SULFUR ODOR AND SMOKE IN CABIN WAS REPORTED. ACCOMPANIED BY GRINDING NOISE. AIRCRAFT WAS GROUNDED. MAINTENANCE REPLACED THE RIGHT AIR CYCLE MACHINE AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK IAW AMM 21-51-05-000-801-A.