What was found
AFTER INSTALLATION OF OVERHAULED STARTER/GENERATOR ON INITIAL START-OPERATIONAL CHECK, THE STARTER/GENERATOR DID NOT COME ON-LINE, IT WAS RESET WITH NO RESULTS. IT WAS AGAIN RESET AND FUNCTIONED PROPERLY. LATER, ACFT WAS DISPATCHED WITH NO DISCREPANCIES. THE NEXT DAY, A MAINTENANCE RUN WAS PERFORMED TO VERIFY AN OIL SEEP ON THE TAIL GEARBOX. ACFT STARTED NORMAL, BUT GENERATOR DID NOT COME ON-LINE. AFTER SEVERAL ATTEMPTS TO RESET FAILED, STARTER/GENERATOR WAS REMOVED AND REPLACED. SUBMITTER SUSPECTS INTERNAL FAILURE, INADEQUATE OVERHAUL, OR BENCH TESTING PROCEDURES.