cointilt

Hi all, I pulled a couple fault codes from inpa which were 2821 and 2821 which is a bad manifold flap adjuster (disa),has anyone done this fix? I can't find much on the Internet and one chap mentioned about having to remove the manifold to get to the bottom screw from underneath. I can get to the top screws after moving a lot of the wiring and other bits.

The symptoms are a rough idle and sometimes get a misfire if driving enthusiastically. Any feedback would be great!