What was found
CREW REPORTED RT MLG SHOWED UP EVEN THOUGH IT WAS DOWN, ALONG WITH LG LEVER DISAGREE MSG AND BRAKE CTRL FAULT, CREW DECLARED EMERGENCY AND PERFORMED GO-AROUND. LANDED WITHOUT INCIDENT IN PHL. MAINTENANCE PERFORMED OPS CHECKS AND FUNCTIONAL CHECKS OF UPLOCK AND PROX SYSTEM, LUBED MLG UPLOCK ROLLERS, PERFORMED NUMEROUS GEAR SWINGS ALL PER EMB AMM, AND NO DEFECTS WERE FOUND. A/C WAS THEN RETURNED TO SERVICE.