As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEICE PRESS CAUTION ON CLIMB OUT. RETURNED TO FIELD. LANDING UNEVENTFUL. NO ASSOCIATED FAULTS IN CDS. COMPLIED WITH TACTILE INSPECTION OF AIRFRAME DEICE BOOTS. NO DEFECTS NOTED. C/W FUNCTIONAL TEST OF THE AIRFRAME PNEUMATIC DEICING SYSTEM. SYSTEM OP'S CHECKS GOOD. DEICE PRESS CAUTION LIGHT DID NOT ILLUMINATE. REF Q400 AMM TASK 30-11-00-720-801. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.