As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER START OF NR 2 ENGINE COCKPIT BECAME HOT AND SMELLED OF SULFER. FLIGHT ATTENDANT REPORTED ODOR OF SULFER AND A HAZE IN CABIN. AIRCRAFT WAS GROUNDED. MAINTENANCE FOUND THE NR 1 AIR CYCLE MACHINE SIEZED AND REPLACED IT IAW AMM 21-51-05. A SATISFACTORY OPS CHECK WAS ACCOMPLISHED.