I am trying to get into the heat duct under the front seats that feeds the rear seats on our 91 300TE. I think one of my kids let a crayon roll into the duct and now it is rolling back and forth with the motion of the car. I am afraid if we really use the heat it might melt in the duct.

I took the front section of the duct off by removing just the one philips screw, but I can't seem to get any further. Would anyone out there be so kind to point out how I can get this out? Thanks.