Barry,
First you are correct, I misspoke when I said AIU instead of TIU. I do know better. I appreciate your suggestion and will pass it on to my friend. I know for sure he has not tried that test. However, I do know for sure he did talk to MTH a couple of times to which one time they told him the new version of DCS was partly created to correct his problem as they have heard about it from several other hobbyist. This is why I love this forum as there is always someone willing to help no matter how dumb the question is. Thank you again and thank you for your dedication and love for the hobby.
Gandydancer