So just take apart the dash and re-glue basically?
Actually, there's nothing to glue. The vinyl crash pad material is backed by foam which is glued to the shaped plastic behind that. The vinyl doesn't separate from the foam or the foam from the plastic it just bulges for some reason.
I thought of perhaps putting glue mix into a syringe and injecting it in several areas of the foam and the clamping it flat, but i never tried it. All three of my 93LE dashes have the same issue.