As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED, ON APPROACH, AFTER GEAR EXTENSION, GEAR UNLOCK LIGHT REMAINED ILLUMINATED WITH NO RT MLG DOWNLOCK INDICATION. PERFORMED EMERGENCY EXTENSION OF LANDING GEAR, AND DECLARED AN EMERGENCY. LANDING WAS UNEVENTFUL. MX FOUND RT MAIN GEAR DOWNLOCK SWITCH LEAKING AT ACTUATOR. REMOVED AND REPLACED AFFECTED SWITCH SEALS. REPLACED SEAL RETAINER AS A PRECUATIONARY MEASURE. PERFORMED GEAR RETRACTION AND EXTENSIONS CHECKS. NO DEFECTS NOTED. RETURNED ACFT TO SERVICE.