What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INBOUND INTO PHL DUE TO THE FLIGHT CREW REPORTING THAT AT 1,200 FEET ON FINAL THEY GOT ECAM BRAKES ALTERNATE BRAKE FAULT. THE FLIGHT CREW ABORTED THE APPROACH AND ACCOMPLISHED THE ECAM PROCEDURES ALONG WITH THE SUPPLEMENTAL ACTIONS. THE AIRCRAFT SWITCHED TO A LONGER RUNWAY AND LANDED SAFELY AT PHL WITHOUT FURHTER INCIDENT. MAINTENANCE REPLACED ALTERNATE-BRAKE DIRECT DRIVE VALVE (97GG) AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 32-43-35 WITH NO FAULTS OR ISSUES NOTED