Fix the sagging headliner around the third brake light 

This is my solution on how to fix the headliner that often sags around the third brake light on Peugeot 406 coupés. Use a two component putty or epoxy, instead of glue, and hopefully you will also be able to fix this annoying and unsightly issue!
Comment réparer / fixer la garniture de plafond / pavillon (autour du troisième feu stop) sur une Peugeot 406 coupé avec epoxy.
Update: I recently came across this nice old but official looking video with instructions on how to remove the headliner / headlining, among many other parts of the coupé:
• Défi-Interventions Div...