I had issues with my EGTs a few years ago. Rather than pay the price for new OE ones, I replaced the PCBs with ones from http://www.sidmotorsport.pl/. I believe someone here on the forum recommended them. I don't think they advertise them on their site, you have to email sidaudis4@gmail.com. Andre's communication was prompt, and I think the total turnaround time was around one month.

You just have to de-solder the old boards (I want to say there are 5 solder points?) and then install the new ones. No too difficult.

Three years later mine are still working fine.