NAD C356BEE not powering on, clicking sound of relays

Hi,

after an over-tention on my electrical circuits, the NAD C356BEE refuses to startup.

We have 3 phase and because of some wire-thiefs, the neutral wire connected to ground at the power station was stolen. Result an over tention of over 300V at my house. Part caused by the bad wirering of the neutral by my electrician. That I already fixed myself. The over-tention broke some other electronics too.

Because of that, I thought the power pcb was defected. I detached the multi-connector from the power pcb to the main amp and checked all voltages. All were correct.

Connected to the main amp board, a clicking sound of a relay appears and the amp doesn't power up. 

Any suggestions or people experienced the same with this amplifier.