As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2392: RT MAIN GREEN DOWN LOCKED LIGHT AND RED UNSAFE LIGHT ILLUMINATED. GEAR APPEARED TO STAY UP AND LOCKED. ALL OTHER INDICATIONS NORMAL. MAINTENANCE QUERIED PSEU AND FOUND RGDLK1 FAULT. PROX SENSOR OPEN FLIGHT LEG 01. REMOVED AND REPLACED S13RGDK1 IAW 32-61-06-000-802/400-802. PERFORMED OPS TEST OF LANDING GEAR EXTENSION AND RETRACTION IAW 32-31-00-710-801. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.