Fleetwood d'Elegance

I have a 87 Fleetwood d'Elegeance in which the sky (the inner part of the roof) comes down, like in bubbles. If I go to the upholstery, it costs my up to EUR 1.000,-- Has anyone an idea to repair?
Thks for help
Pls mail: snipped-for-privacy@chello.at

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