What was found
AIRCRAFT EXPERIENCED AN ELECTRICAL POWER SHUTDOWN & REBOOT. STARTER ENGAGED WARNING WAS OBSERVED. THE STARTER, STARTER SWITCH, STARTER CONTACTOR, AND STARTER RELAY WERE REPLACED WITH NEW UNITS. GROUND OPS CHECKED AND SUBSEQUENT FLIGHT TEST OK. RESULTS OF TROUBLESHOOTING SUSPECT THE MOST LIKELY CAUSE A DEFECTIVE STARTER RELAY, BUT IS NOT CONCLUSIVE. ITEM 5. BELOW IS NOT COMPLETED BECAUSE WHICH SPECIFIC PART OF THE REPLACED PARTS WAS UNCONFIRMED.