As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CAS, DEICE BOOTS, ILLUMINATING IF DE-ICE BOOTS USED IN OUTSIDE AIR TEMPERATURE LOWER THAN -20 DEGREES CELSIUS. DURING TROUBLESHOOTING FOUND MOISTURE IN PRESSURE GAGE SWITCH. SWITCH REPLACED WITH SERVICEABLE UNIT. AIRCRAFT RETURNED TO SERVICE. SYSTEM WORKING PROPERLY NOW IN COLD TEMPERATURES.