During the rain storm last week I had taped up the window and the leaking stopped so I was pretty sure that is were the problem was. I had removed and cleaned the window seals and thought I might have fixed it, as I couldn't repeat the leak.
Was washing and inspecting the roof today and the window started to leak. I took the window out and upon inspection it appears the water was only intruding into the right bottom corner of the window. There the luan was dark with moisture and the foam insulation that it was glued to was slightly damp. The luan around the rest of the window was dry with no signs of old or new leaks. I've got the window out now to allow the luan to dry before I re-install it. We are forecast for several more days of clear dry weather, thank goodness.
Thanks for all of your responses. Spike99, Thanks for the link on how to DIY this fix. Without it, I might not have tried it.
Carolyn