What was found
(CAN) NR 1 DC GENERATOR CAUTION IN CLIMB. CREW RESET THE SW. MESSAGE CLEARED MOMENTARLY BUT RETURNED. DC STARTER/GENERATION SYSTEMS, NR 1 STARTER GEN. REPLACED IAW AMM 24-31-01. OPS AND FUNCTION CHECK OF STARTER/GEN CARRIED OUT. NO FAULTS FOUND. LEAK CHECK CARRIED OUT AND CHECKS SERVICEABLE. WHEN STARTER REMOVED FROM ENGINE THE SHAFT STAYED WITH ENGINE AND IT WAS FOUND THAT THE SHAFT HAD SHEARED AT THE FAN END OF THE STARTER GEN. THE FAN HAD CONTACTED THE LIVE TERMINALS WITHIN THE HSG AND ARCING HAD OCCURRED. NOT KNOWN AT THIS TIME THE SEQUENCE OF EVENTS.