As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ANTI ICE DUCT WARNING ON CLIMBOUT, QRH COMPLIED WITH. MESSAGE PERSISTED FOR ADDITIONAL 5+ MINUTES BEFORE SELF EXTINGUISHING ON SHORT FINAL. RETURNED TO DEPARTURE, EMERGENCY DECLARED. FOUND SENSING ELEMENT TOUCHING DUCTING IN LT MLG WW AREA. REPOSITION SENSING ELEMENT. PERFORM DUCT MON TEST, AND RAN BOTH ENGINES WITH 14TH STAGE BLEED AIR. OPS CHECK GOOD IAW AMM 36-21-00. (SDR CLOSED)