[TG] ST6001 Smart Pilot Blows Breaker

[WWMS]

Troubleshooting update. The course computer is a Smart Pilot S2. The controller is a Auto helm ST6001. Disconnected all accessories one at a time at the computer then replaced, drive, feedback, compass, seatalk etc. The main breaker still tripped with each disconnected item and a buzzing sound was heard at the computer each time till the breaker tripped So the computer is suspect. Is further testing required? What would be in the computer that buzzes, transformer maybe? Do we send it in for repair or replace it? Thank you.