Speaker removal 1998 V70

I have a faulty speaker in the driver's door of a 98 V70 and want to remove
and replace it. It is mounted in a plastic frame. The frame is fastened to
the door with one torx screw and two red plastic "screws" of some sort. I've
removed the torx screw but am quite unable to remove the red plastic screws.
The heads are slotted. I've turned them 90 degrees with the thought that
they would release, but they don't. I've tryed some gentle prying but they
still won't release. I am concerned that any additional force might break
something. Am I missing something obvious? Can anyone tell me how to get
these off? Any advice much appreciated.

 

OK. I solved this riddle. I just gripped the screw with a pliers and they
just pull out with a bit of pressure.

 

According to the Heynes manual:

"Undo the speaker retaining screw at the base, then turn the plastic
fasteners either side through 90 degrees. Support the speaker, prise the
plastic pegs either side out of the door"

Ken