UPDATE !!!
It's been raining a good bit since I've made the original post and have had time to study why roof run off water was traveling back under the seams and entering into the inside walls. Mind you, that this water is water that has already passed the roof trim and now running down the siding and when it hit the siding drip edge it was curling back up into the seam itself. Capillary action then took it up the seam and entered the back side of the siding joint, dripping in the inside. This only happened with a moderate rain. I actually watched this happen.
After a few experiments, trial and error, I found why this was happening. Over time, these seams gather dust and dirt, which never gets cleaned when the TT gets washed. Where heavier deposits of this dust/dirt in spots, it acts as a channel for capillary action to occur. The solution to this problem was quit simple. I washed out the seams with a brush and soapy water, let it dry, then used wax-n-wash so I could leave a wax film on whatever I washed. (wax repels water causing it to bead). It's rained twice since I did that and not a drop of water entered the TT. I even stood in the rain to watch. All the rain water run over the siding and not once did I see the water curl back under into the siding seams.
This is a first for me. I never really thought before this incident, that this could happen. I now have a leak free TT and hope this helps anyone with a difficult leak problem.
Thanks all for your thoughts and suggestions.
