As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STL - DURING APPROACH FIRST ATTEMPT AT GEAR EXTENSION RESULTED IN ALL THREE RED LIGHTS ILLUMINATING AND GEAR DOOR OPEN LIGHT ILLUMINATED. SECOND ATTEMPT SAME RESULT. PUMPS ON GOOD FLUID AND PRESSURE. EMERGENCY EXTENSION CHECKLIST STARTED. GEAR SHOWED ALL SAFE INDICATIONS. LANDED STL WITHOUT INCIDENT. REPLACED THE LANDING GEAR LEVER SWITCH 51 89. SYSTEM GROUND CHECKED NORMAL OPERATION.