94 Civic window tilts as it rolls up

My 94 Civic’s passenger side window rolls up perfectly O.K. until the last 1/4" to 1/8" or so. It tilts toward the front, so that it does not close properly.

The condition is much worse when it rains, but it does that when dry as well.

What should I look for when I open up the door?

Is it an easy fix?

The glass is supported by a metal framework, channels that guide the glass as it moves up and down. One of those channels has broken loose, perhaps from someone slamming the door?? The damaged parts should be easy to spot once the door-panel has been removed…