More Recirculation Flap

[Kerry Griffith]

I've got the non-closing recirculation flap behind the glovebox, yet my
return spring is attached and functional. The flap won't close all the way,
even if I press on it. No visible blockage, from the footwell. Does this
indicate vacuum problem such as recirc vent motor/hose or intake
manifold/vacuum reservoir check valve, or could it point toward some foreign
object having wedged itself in the dark recesses?

TIA,
Kerry