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Electric board will not start mosfet dead?

Hallo i have this chinese carbon electric 10kw surfboard. When i try to start it the light on the throttle grip flashes 13X .the manual says upper bridge mosfet broke on the motor controller. Does anyone know where the motor controller is located so i can fix the problem without making cuts in the board??

Hi
I have one of those as well with a problem in the ESC.

Could you please send the ESC manual or a link

Thanks