Where can I repair my SuperMirco motherboard?

Question

motherboards

Good afternoon!
Tell me, please, who knows where you can send a SuperMirco server motherboard for 2011 socket for repair/diagnostics?
One of the motherboards from Ebay turned out to be non-working.
There are no official SuperMirco SCs in Russia. In offices that do everything from washing machines to smartphones, there is also no desire to pay a fee. I would like to find a specialized company.
Where to go? Preferably Spb. If you don’t know St. Petersburg, then Moscow time or other cities of the Russian Federation.
I will be grateful for advice.

Answer 1

In any normal workshop. Usually, manufacturers trust warranty repairs.

Answer 2

Look here: https://www.servicebox.ru/Moskva/supermicro/