I need to remove the inner door panel on the driver's side rear door on my 1987 300E (reasons: to replace the check strap and investigate a non-working window; all switches are good). I have removed the front door panel and it was no problem popping it loose, but the rear one seems to be held on very tightly by numberous clips around virtually the entire perimeter and I'm afraid of breaking something by forcing it off. Can someone tell me how to remove rear door panel? Thanks