As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW RETURNED TO FIELD DUE TO SMOKE IN CABIN ALONG WITH PACK 2 FAIL, LANDED WITHOUT INCIDENT AT DEN. MAINTENANCE REMOVED AND REPLACED THE RT HEAT EXCHANGER PER AMM, OPS CHECK GOOD. CREW RETURNED TO FIELD DUE TO SMOKE IN CABIN ALONG WITH PACK 2 FAIL, LANDED WITHOUT INCIDENT AT DEN. MAINTENANCE PLACED PACK NR 2 ON MEL 21-51-00-1. A/C WAS THEN RETURNED TO SERVICE.