Hi AlanHi Charles. I presume you mean
You could remove (pull off) the lining on the outer panel. It will pull off separately to the inner panel lining and comes off quite easily.
The snagged is it will leave behind the glue and the foam backing and this will have to be scrapped off which is messy job involving some sort of softening agent (I used kitchen surface cleaner and then a scrapper). I think this will be very difficult to do without marking the good centre panel, especially when working near the groove.
Then the inner panel will have to be masked off to protect it from the impact glue that is sprayed on.
I suppose you could glue the new lining on top of the old residual foam and glue, but that may be risky - the impact glue may not work and the new lining may have bumps all over it as it is not going onto a smooth surface. Try this entirely at your own risk!
Edit: In photo 33 the old glue and foam is the orange colour and behind is the cream coloured biscuit which can be seen in odd places. Glueing over that may be problematic.
Note the outer panel feels fragile and seems to be made of a fibre board of some type. The inner panel is hard and looks like fibre glass.
Hmm I might try and debond the two, I can design and 3d print so I could make brackets to glue to the back of the two if there is space.
I've already tried to re glue and its only lasted about 3 months (still looked smart)
I suppose if I damage the Centre when relining the edge I can just do what you've done! or if its too hard ill contact a member on here that offers the service!