OK, first, I see you keep calling it a "Trak Pak PCB"... stop, it is an Off-Road PCB with Track Pak ROM's installed on it.... small difference, but it opens up buying a working PCB with regular ROM's which is far more common.
You can buy a PCB off Ebay and swap the Track Pak ROM's onto it along with the security chip and your good to go assuming the ROM's aren't the issue.
If the ROM's are the issue, STEPH (Hobby ROM's) will be your man to burn them.
The only thing that CANNOT be made is the security chip.... so don't damage that!
As there are so many, I would work with Steph or somebody that can verify them so you don't replace good ones.
I have a spare boardset, but the top PCB is bad, I use it to store my regular ROM's on as I have a Trak Pak installed in my machine too. I've seen boards go for $15 on Ebay, so start watching for them, even if you get a bad one, it is likely one of your boards is still good and you can swap them back and forth and get a working one with some luck...