As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT BLEED DUCT LEAK EICAS MESSAGE QRH PROCEDURE ACCOMPLISHED. AIR TURNBACK DUE TO INABILITY TO REMAIN OUT OF ICING CONDITIONS EN ROUTE TO DSM. REMOVED AND REPLACED CRACKED DUCT AT LT WING LEADING EACU CHECKS NORMAL. ACCOMPL. LEAK DETECTION BITE PROCEDURE AND MEMORY ERASE PROCEDURES SYSTEM TEST NORMAL OK FOR SERVICE.