Starting to see some decayed plywood slivers falling on to the dash, seems to be dropping from behind the vinyl headliner just behind the windshield. Anyone have experience with the best way to remove this headliner panel and the "A" pillar vinyl covers? (hidden clips, screws, etc) ['late '70's pre-Regal]

i replaced mine some time ago and the vinyl was glued and it will come off very carefully.