What was found
SEA - FLT 251 - DURING APPROACH TO SEAT WHEN LANDING GEAR EXTENDED, THREE RED LANDING GEAR LIGHTS REMAINED ILLUMINATED WITH NO GREEN LIGHTS. NOSE LANDING GEAR PIN INDICATED GEAR DOWN. RECYCLED LANDING GEAR AND ALL INDICATIONS RETURNED TO NORMAL WITH THREE GREEN LIGHTS. AIRCRAFT LANDED SEAT WITHOUT INCIDENT. REPLACED LANDING GEAR INTERLOCK RELAY R2-28. ACCOMPLISHED LANDING GEAR RETRACTION CHECK WITH NO DEFECTS FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)