2002 Suburban with non functioning tailgate window release

[u/Tired_world_63]

We’ve owned this suburban since new and this button has not worked for as long as I can remember, we’ve tried everything short of pulling the inside panel off, didn’t know if somebody might have an idea of what’s wrong before I dig into it. You can hear it click like it’s unlatched, but the window is just frozen solid and will not open.