As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, THE CREW RECEIVED A RIGHT EMERGENCY DOOR ILLUMINATION AND YELLOW CAS MESSAGE. UPON ARRIVAL AT PHL, OUTSTATION MAINTENANCE FOUND CODE S42 IN THE PSEU. MAINTENANCE THEN CLEANED AND INSPECTED THE PROXY SENSOR AND TARGET IN ACCORDANCE WITH BOMBARDIER MAINTENANCE MANUAL 52-00-00 AND FOUND NO DEFECTS. THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.