What was found
(CAN) AFTER DEPARTURE THE RH AC BUS ANNUNCIATOR ILLUMINATED. TROUBLE SHOOTING CARRIED OUT BY THE CREW WAS UNSUCCESSFUL. THE AIRCRAFT RETURNED TO THE POINT OF DEPARTURE AS THIS WAS A MAINTENANCE BASE. UPON ARRIVAL A SYSTEM INSPECTION WAS COMPLETED AND MAINTENANCE NOTED THAT A RING TERMINAL WAS FOUND BROKEN ON WIRE V12A10 AT RELAY K145. A NEW TERMINAL WAS INSTALLED WITH REFERENCE TO WIRING DIAGRAM MANUAL 24-21-02. SYSTEM WAS FUNCTION TESTED WITH NO FAULTS NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.