PC Lab that handles foreign computers Tokyo/Saitama

Hi all, I think that using a power converter for my desktop that I brought from abroad (European voltage) ended up damaging my motherboard/ram, and now my desktop won't boot.
Considering that replacing both the PSU and the memory didn't fix it I'm inclined to think it's the motherboard, but I don't really want to experiment with reassembling it myself in vain.

I tried taking it to Nojima and some labs in my area (border between Tokyo and Saitama) but none of them would accept foreign PCs (using a Biostar B560GTQ motherboard).
I saw an old post recommending Loratec in Kawaguchi but they only seem to be accepting 'business' projects now, and while I do head a company and use the PC for work as well, it's a personal computer.

Rather than dragging my desktop around in a suitcase to try my luck in Akihabara stores, I figured it'd be best to ask here, and would appreciate recommendations.

by Zuliau