What was found
(CAN) LT GENERATOR FAIL LIGHT CAME ON IN FLIGHT. ACFT CONTINUED TO DESTINATION. MAINTENANCE DISPATCHED TO LOCATION FOR TROUBLESHOOTING/REPAIR. UPON INSPECTION OF STARTER/GENERATOR, IT WAS NOTED THAT THERE WAS DAMAGE TO THE COOLING FAN, AND A LARGE AMOUNT OF PLAY IN THE SHAFT DUE END BEARING FAILURE. UNSCHEDULED STARTER/GENERATOR INSPECTION COMPLETED IAW MM, NO DEFECTS NOTED. STARTER/GENERATOR REPLACED WITH SERVICEABLE UNIT, OPS CHECK OK, ACFT RETURNED TO SERVICE.