As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SULFUR SMELL IN COCKPIT AND FRONT HALF OF CABIN DURING TAKEOFF AND DESCENT-C/A-PERFORMED FIM TASK 21-20-00-810-801-A AND RAN ENGINES WITH CREW IAW ETN-EM-72-034. TROUBLESHOOTING LEANING TO PACK 1MALFUNCTION. SEE ITEM 2 OF AML PG# 4594727 FOR CONTINUED DISCREPANCY