Could you get a cheap usb wifi adapter in the interim? Would be a shame to write off the whole board just because of one issue.

Have you done much fault-finding to verify it's a hardware issue?

Yeah, the physical wifi unit is only showing intermittently, this has been happening over the last few months and a reboot would get it running but it is completely non functional now.

The pi is enclosed in a 3d printer with limited space so would prefer a replacement as the first option if I can get hold of one.

I'm in the process of migrating some services from my Pi 3B+ to docker on my NAS. I'll be done in the next couple of weeks and when it's done I won't need the Pi any more. How urgently do you need it?

I would love to get something sooner, but please keep me in the loop in case I havent resolved it by then.