What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED ON APPROACH INTO BNA DUE TO THE FLIGHT CREW REPORTING A "ALT R RELEASED"ECAM ON FINAL APPROACH. THE FLIGHT CREW ACCOMPLISHED A MISSED APPROACH IN ORDER TO ACCOMPLISH THE APPROPRIATE CHECKLIST. THE AIRCRAFT LANDED SAFELY AT BNA WITHOUT FURTHER INCIDENT. MAINTENANCE RETRIEVED TROUBLESHOOTING DATA OF THE BSCU FOUND BRK ALTN SERVOVLV MSG(98GG)/ABCU(95GG). TROUBLESHOOT MSG IAW TSM 32-43-00-810-825. AFTER PERFORMING OPS CHECK TO START THE FUNCTIONAL TEST OF THE ALT BRAKING AUTOMATICALLY, FAULT NOT PRESENT. CONTINUED T/S PER TSM. CHECKED APTR VALUE, FOUND TO BE WITHIN LIMITS AT 2080PSI. DUE TO THE HISTORY, REMOVED AND REPLACED R SERVO VALVE ALTN BRK (98GG) IAW AMM 32-43-35. OPS AND LEAK CHECK GOOD. REPERFORMED OPS CHECK TO START THE FUNCTIONAL TEST OF THE ALT BRAKING AUTOMATICALLY, FAULT STILL NOT PRESENT. A/C OK FOR SERVICE.