2007-2013 Chevrolet Tahoe, Silverado, Sierra Door won’t OPEN from inside or outside? Here’s the fix!

The drivers door on my wife’s ‘13 Tahoe wouldn’t open. There are several videos on your e describing ways to “fix” this. My issue wasn’t any of these so I wanted to share the problem I found and how I fixed it.
#doorwontopen
#silverado
#tahoe
#sierra