Your front and rear tracks are dry.
Don't rush in to tear it apart.
A little lube on the tracks got my '68 gliding again.
Before that my princess couldn't even roll up the passenger window.
A lite spray of silicon spray or light aerosol lube should work.
There are nylon rollers that get sloppy after a while but that is evidenced by a loose glass panel movement from side to side.
Try it and see if that suffices
Still unsatisfactory then we'll get the panel off off for you.