What was found
AIRCRAFT WAS GROUNDED: ON APROACH INTO CMH CREW LOWERED LANDING GEAR AND GOT BRAKES ALTERANTE RIGHT RELEASED ECAM MESSASGE. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED SAFELY AT CMH WITHOUT FURTEHR INCIDENT. MAINTENANCE REPLACED THE RIGHT HAND ALTERNATE BRAKE MANIFOLD PER AMM 32-43-32. (AALA202209278913) AND REPLACED THE ALTERNATE BRAKING CONTROL UNIT PER AMM 32-43-34. (AALA202209271393). A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.