06-29-2011 06:18 AM
Try using the Component Test located under the Diagnostics Menu of the Control Panel. This diagnostic should let you run hardware tests on individual components until you can isolate the squeek. Once you find it then look up the part number in the Service Manual:
It could be as easy as swapping out your toner cartridges. If you have spares or alternative cartridges from another 3525 try swapping them out.
07-01-2011 05:59 AM
The good news is that if the component test did not reproduce the squeek that your part will be relatively easy and cheap to repair. It is most likely a roller of some kind at this point. I'd suggest purchasing a roller kit and swapping them out one at a time until the problem goes away.
Unless you can put your ear down to the printer and listen to what part of the printer the squeek is coming from I wont be able to help you much more from here. Remember to also try swapping out the cartridges if you have another 3525 lying around to rule out another easy fix.