Wish I had your troubleshooting knowledge. Impressive to say the least.
Fantastic work!The KNA6034201 reproductions from @caius arrived and FINALLY the board set is working 100% with no jailbars!
I ran the board for 24 hours as a "soak test" just to make sure that everything was solid. For good measure, I tried swapping in each of the original KN customs one at a time just to see if one of them was good, but unfortunately both custom chips have issues.
In the end, I ended up replacing 14 failed chips across both the middle and bottom boards.
One more update to come after I program, install and test the M72 Multi!
There's also that awesome blog: