What was found
CLT - UPON LOWERING LANDING GEAR, CREW RECEIVED A GEAR INDICATION OF 3 GREEN AND 3 RED. CREW ACCOMPLISHED A GO-AROUND, CYCLED THE GEAR AND RECEIVED A NORMAL GEAR INDICATION OF 3 GREEN. FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE JACKED AIRCRAFT AND TROUBLESHOT SYSTEM. PERFORMED LANDING GEAR EXTENSION/WARNING CHECK PER JOB CARD J332-60-1 AND SWUNG GEAR SEVERAL TIMES. COULD NOT DUPLICATE PROBLEM. CLEANED AND LUBRICATED SWITCHES AT LANDING GEAR CONTROL LEVER. OPERATIONAL CHECK GOOD.