Hi! we just bought a 2015 Yukon SLT in white diamond color.It's beautiful! we have a Bullmastiff named Henry and he is now 90 lbs soon to be 130 lbs! so had to get a larger rig. We (or I) named our Yukon Henrietta! I am having a bit of issues with programing the radio with XM stations etc. I follow the instructions exactly in the manual but it isn't working. any help on where I can see detailed videos would be greatly appreciated. I've tried You Tube. should I take it to a GMC dealer? help!