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Hi my name is Robert....
I would be looking at any areas where the cabinet meets the wall or ceiling to see if the noise is coming from that area, the only way to get the nose to stop is to get into the area and check all the mounting hardware, if you see any gaps where it meets the ceiling or wall you can try to force some foam rubber between the two surfaces and that will normally quite down the noise, it would be hard for me to say where the squeak is coming from but once you access the area and find any suspect areas then you can tighten things up or add foam tape is needed. It might require someone looking around while you are driving, many times if the area is loose or moving and making the noise you might be able to feel it. I do not think you are in any danger but the noise can be annoying.... Hope this helps some.... Robert