Interior Wall Leak Repair

[MR M]

Wall leak repair advice please. We just purchased an Expanda and have found that the has been a leak which caused the front right side interior panel to delaminate. Ive stripped out but have a few questions on repairing.
1- How do the Jayco replacement panels come (do they come as 2 sheets of ply with foam in the middle)?
2- The ply between the external fibreglass panel recesses behind the frame (see pic) does this have to be the same or just glue new sheet to fibreglass? I thought about using angle or T section aluminium to the frame so it has better support

 

[Drover]

The whole wall is a laminated composite panel, like fridge panels, plywood sandwich with foam in the middle, outer side with a resin coating, spot repairs can be done but major panel damage they replace the whole wall usually.................... no lattice framing ........... depending on van size I think may be in 2 parts but I don't think so, been awhile since I saw the factory tour video.....

Once the leak is found and sealed I suppose one could, using the same density foam and lots of glue, that doesn't eat styro, resheet and glue in a sheet of ply to finish off, should be possible I think.......................

I got sideswiped by a truck once and the large tear in the fibreglass about 300mm x 50mm was cut out and a patch panel fitted in then it was sprayed over and polished up but you could still notice the repair in certain light, they did say if it was bigger then they would replace the wall as any repair could just open up with flexing.......