As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 7775 - SEA TO SEA - FLIGHT CREW REPORTED PACK 1 OVERLOAD - ICE DET FAIL. FLIGHT CREW RETURNED TO BLOCK WITHOUT INCIDENTS. MX PERSONNEL REMOVED AND REPLACED PRESSURE SWITCH OPERATIONALLY CHECKED SATISFACTORY. A/C WAS RELEASED TO RETURN FOR SERVICE.