As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCE - LEFT MAIN GEAR INDICATES DOWN AND LOCK LIGHT CAME ON IN FLIGHT. WHEN GEAR WAS EXTENDED GREEN LIGHTS WENT OUT AND RED LIGHTS ILLUMINATED. WHEN GEAR LOCKED DOWN ALL RED LIGHTS WENT OUT AND GREEN LIGHTS ILLUMINATED. MAINTENANCE REPLACED LEFT MAIN GEAR DOWNLOCK MICROSWITCH. SYSTEM OPERATIONAL CHECK NORMAL DURING GEAR RETRACTION CHECK. AIRCRAFT RETURNED TO SERVICE. (M)