Please help with water leak problem

[E Kaplan]

Need some assistance. My carpet is wet, mostly behind the seats. Also, the padding behind the seats, in front of the engine is also wet. I checked and cleaned both front drainage tubes, the evaporator tube and the two rear drainage tubes. All are clear.

I know from the pics that there is also another drainage tube from the water tray somewhere in back of the drivers seat, but I can't tell from the pictures where this is located. I am hoping this is the clogged tube.

Can somebody describe exactly how to get to the rear drainage tube for the water tray. The Foley pics did not help me.

Thanks.

Eric