I has same issue and turned out that the awning end fabric had slid in the horizontal exterior wall groove causing the awning to not be aligned properly. I found the set screw on the groove was not tightened properly allowing the fabric to slide in the groove about 1" (just enough to cause the awning arms to bind and not close completely. I backed off the set screw, slid awning fabric back into place, tested operation, and then tightened screw to ensure the screw penetrated the fabric bead. The awing has closed properly since. I saw no reason to make to dealer as this was one of those nuisance adjustment items that I could handle with ease.
Steve Rinker
Rochester, NY
2013 Keystone Sydney 340FBH 5th Wheel, 12,280 lbs loaded (scale)
2015.5 GMC Sierra Denali 3500, SRW, Duramax, CC, Payload 3,700 (sticker- not scaled yet)
Take my posts for what they are, opinions based on my own experiences.