'99 Tahoe back door

I have a '99 Tahoe and the back door will not open. The glass part will open but the door part will not come down. Any sugestions. I don't want to take it to the dealer if all possible.

Im thinking that a link from the hanle to the release on either side of the gate has broken or losened. I dont know if its possible to remove the handle OR panel without removing the gate.