Hie, I have a 96 240sx. I recently tinted my car. However a vertical scratch started forming once i kept bringing my window up and down. I talked to the guy at the tint place and he said I had to change something inside the door. Would someone know what it is? and where do i find instructions on removing my door panel? thanks.

 

passenger or driver side door?

 

If i'm not mistaken, there is a bolt or two in the Jam, and one near the handle. After those are out, just pop the panel off.
Pretty simple to remove.
There could be a bent rod or something internal that is out-of-place.

When you take the panel off, roll the window up and down, it shouldn't be very hard to see what is causing the scratch.

good luck

 

both windows, however the driver side is bad. Thanks alot for the help. So i guess it isn't a common part that gets warned out then.