As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB-OUT FROM CLE WITH PACK 2 DEFERRED WERE UNABLE TO MAINTAIN COMFORTABLE CABIN/COCKPIT TEMPERATURE. TEMPERATURE REACHED 38 DEGREES C IN COCKPIT. WE SMELLED SOMETHING BURNING. FA REPORTED HEARING A LOUD POP. WE COULD FEEL IT GETTING WARMER QUITE RAPIDLY. THEN PUT OXYGEN MASKS ON AND MADE A RAPID DESCENT TO 10,000FT AND SHUT PACK OFF AND MADE PRECAUTIONARY LANDING AT CMH.