As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - FLIGHT 4183 ANTI ICE DUCT WARNING MESSAGE. SYNOPTIC PAGE INDICATED LEFT WING AFFECTED. MESSAGE EXTINGUISHED WHEN TURNING WING ANTI ICE OFF PER CHECKLIST. MAINTENANCE COMPLIED WITH LEAK TEST OF WING ANTI ICE DUCTS. NO LEAKS NOTED. COMPLIED WITH OP TEST OF WING ANTI ICE CONTROL AND INDICATIONS. NO DISCREPANCIES NOTED. AIRCRAFT RETURNED TO SERVICE.