Update on our DIY repairs:
Purchased 2 - 1oz tubes of VLP Vinyl/Leather Repair
Applied it to the seams on the inside of the awning and on the outside.
After letting it set overnight, did a water test, there were a couple spots that I missed and needed to go over.
After 2nd application to missed spots, no more leaks. So far it seems to work. Time will be the sure test.
Note: We have 2 awning on our trailer and 2 - 1oz tubes was sufficient to do both awnings. Though I want to get another tube to carry with me just in case I need to do spot repairs while camping.
FYI - We did called Dometic about it and they said the seams would seal themselves over time. Not sure how much time they think it should take because we're in our 2nd camping season with our trailer. So Dometic was of no help either.