Ron_S posted:John,
I ordered 9 boards and enough of the diodes and TVS to populate the 9 boards. I will work on soldering them into units and do a test run on a wounded TIU to see if it works.
If the TIU is already wounded, you may have to replace the 74ACT244 as well. This won't fix cooked outputs, it's only protecting them, or at least the hope is it will protect them.