As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - RIGHT MAIN GEAR INDICATION LIGHT FLICKERS AND PROXIMITY HYD CAS MESSAGE ON GEAR EXTENSION, ONLY RIGHT MAIN GEAR LIGHT FLICKERS. S12 DOWNLOCK SWITCH CANNON PLUG CLEANED AND RESEATED. GEAR INDICATION OPS CHECKED GOOD ON GEAR SWING. AIRCRAFT RETURNED TO SERVICE.