Upgrading door speakers and wiring and am having trouble removing the door panels. Have all screws and push pins removed. Door panel is lose except along the top edge. Seems like it is requiring way more force than expected to lift up and remove the panel. I've read that some piece along the top edge is fragile so I'm trying to avoid anything that feels like forcing it. What's holding this panel on along the top edge? Feels like those toothy panel pins most cars use. Do I just need to muscle it or am I missing something?

Thanks