As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - ON FLIGHT 2394, ON DESCENT, IN ICING CONDITIONS. THE DEICE PRESSURE CAUTION LIGHT ILLUMINATED. CAUTION LIGHT REMAINED ILLUMINATED AFTER THE CHECKLIST WAS RUN. MAINTENANCE DUPLICATED FAULT. INTERROGATED CDS FOR FAULTS. TMU FAIL MESSAGE. REMOVED AND REPLACED TMU. FUNCTIONAL TEST GOOD. AIRCRAFT RETURNED TO SERVICE.