As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 3365 - CREW WAS UNABLE TO CONTROL CABIN TEMPERATURE IN EITHER AUTO OR MANUAL MODE, CREW RETURNED TO FIELD. MAINTENANCE REMOVED AND REPLACED THE LEFT AIR CYCLE MACHINE IAW SAAB MM. OPS CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)