As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DEPARTURE, WHEN POWER WAS FIRST REDUCED, STRONG ODOR OF BURNING SULFUR IN CABIN & COCKPIT. NO SMOKE NOTED. TRIED ISOLATING AC PACKS TO IDENTIFY SOURCE WITHOUT SUCCESS. TROUBLESHOT AND FOUND CABIN AFT ACM FROZEN. R & R ACM & AFT COALESCER, OPS & LEAK CHECKED GOOD IAW MM 21-51-00.