What was found
(CAN) AFTER INSTALLATION OF AN OVERHAULED STARTER/GENERATOR, INITIAL GROUND RUN OPERATION SEEMED SATISFACTORY, HOWERVER SUBSEQUENT FLIGHTS REVEALED THAT THE STARTER WOULD NOT DISENGAGE AUTOMATICALLY. THE START SEQUENCE WAS MANUALLY DISENGAGED AND THE FLIGHT CONTINUED AS NORMAL. UPON RETURN TO HOME BASE, AN OPEN CIRCUIT WAS FOUND IN THE SPEED SENSOR MONOPOLE. AS THIS SENSOR SENDS A SIGNAL TO THE GCU TO AUTOMATICALLY DISENGAGE THE STARTER BETWEEN 38 PERCENT - 42 PERCENT, ITS OPERATION IS IMPORTANT. STARTER GENERATOR REPLACED.