The right rear corner of my sunroof headliner is loose, so that when I pop up the rear of the sunroof for ventilation, the headliner panel on that corner stays down. I can't see how it is supported by looking between the panels, I don't see any loose fastener, etc. Can anyone help?

there are little clips under there. they are a pita

__________________
1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual