As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKE OFF GOT LEFT WINDOW HEAT CAUTION MESSAGE. RETURNED TO FAT. AFTER TROUBLESHOOTING SYSTEM FOUND FORWARD TEMP CONTROLLER INOP AND CANNON PLUGS SWAPPED. PUT CANNON PLUGS IN CORRECT POSITION AND REPLACED FORWARD TEMP CONTROLLER IAW CRJ MM 30-41-00. ALL OPS CHECKS GOOD AT THIS TIME. SN ON FORWARD 2454 SN OFF 2464 SN ON AFT 609, PN ON 1659-1.