As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT INTAKE DEICE BOOT FAILURE APPEARED ON THE ANNUNCIATOR. HOWEVER, ALL BOOTS FUNCTIONED PROPERLY. AFTER TROUBLESHOOTING, DETERMINED THAT AN INTERNAL PRESSURE SENSING SWITCH FAILED CAUSING ERRONOUS READING. REPLACED EJECTOR FLOW CONTROL VALVE.