What was found
EMERGENCY DECLARED, LANDING UNEVENTFUL & ACFT NOT OVERWEIGHT. DURING CRUISE, THE CREW RECORDED A LOGBOOK DISCREPANCY. 1ST DISCREPANCY NAV ALT 1, AFTERWARDS MANY OTHER PROBLEMS. ON ARRIVAL ACFT SHOWED ECAM MSGS, NAV ALT 1, RA 1 FAULT, F/CTL FCDC 1, CAB PR SYS 1. THE CAPTAIN`S AIRSPEED ON THE PFD SHOWED 250KTS AT THE GATE. R & R NR 1 ADIRU IAW AMM 34-12-34. PERFORMED OPERATIONAL CHECK. SYS CHECKED NORMAL.