What was found
(CAN) UNSAFE LANDING INDICATION ON APPROACH, FOLLOWED BY FLT ATTENDANT CHIME RINGING CONSTANTLY, ECAM SHOWED GROUND PROXIMITY WARNING SYSTEM FAILED, STANDBY PITOT FAILURE, LANDING GEAR CONTROL AND INTERFACE NR 1 FAULT, ENGINE NR 1 FAULT. UNABLE TO EXTEND GEAR. GEAR EXTENDED AFTER WAITING FIVE MINUTES AND UNSAFE INDICATION DISAPPEARED. MAINTENANCE FOUND LANDING GEAR CONTROL UNIT AT FAULT AND REPLACED UNIT. SYSTEM TEST CARRIED OUT NORMAL.