What was found
ON APPROACH OF FLIGHT 3072, CREW REPORTED THE CONFIG LIGHT ILLUMINATED ON APPROACH AT 1500 FT AGL/ WITH FLAPS 20 PERCENT THE CONFIG WARNING ILLUMINATED CREW HAD 3 GREEN LIGHTS ON GEAR FLAPS INDICATED 20 DEGREES. CREW DID A GO AROUND (ABORTED APPROACH), TRIED AGAIN NO PROBLEMS. MAINTENANCE CLEANED AND LUBED WOW SWITCHES AND CANNON PLUGS, PERFORMED CONFIG FUNCTIONAL TEST IAW 31-350-00-5. ALL CHECKS GOOD.