Recommended GPU Repairshop in Europe (Germany)

I got a RTX 3080 20 GB from China, which probably has memory issues at higher temperatures. Repasting/repadding didn't resolve the issue. I don't want to reball the memory modules and so I am looking for a repair shop, which is located in the EU (for tax and shipping cost reasons).

It's really tough to find one. Krisfix.de was the only known good repair shop, but they decline to work on 3000 series since 2026.