Terrible window squeaking

My 02 gt is a squeaker. I've tried spraying WD-40 in the window tracks, but that's only a temporary fix. My passenger side barely makes it, but the driver is another story. Im pretty sure the problem is with the black, right hand piece, bc the noise stops after is passes that.

I am under warranty, but was wondering if there is an easier solution. Thanks
 
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I had the same problem so I took the car to Ford. They said the window guides at the top of the door were causing the problem. They replaced them and the problem is now no longer.

PS. I asked them if they could just lube them and they said no, the problem would reappear for sure.