What was found
CLT FLT 719 EN-ROUTE PHL TO CLT. EICAS MESSAGE "GEAR DISAGREE" DISPLAYED AND GEAR AMBER LIGHT ILLUMINATED WITH GREEN GEAR DOWN LIGHTS ILLUMINATED. THE AIRCRAFT ABORTED THE APPROACH AND WENT AROUND. CLT TOWER PROVIDED VISUAL CONFIRMATION THAT THE GEAR WAS DOWN. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. ACCOMPLISHED TROUBLESHOOTING PROCEDURES, NO GEAR RELATED FAULTS SHOWN. PSEU CHECKS OK. VERIFIED NO DAMAGE TO GEAR PROX SENSOR AS PRECAUTION. SYSTEM ON GROUND TEST OK.