Here is how I fixed the squeaking noise of my MacBook Pro. This noise came after i upgraded the memory, so by opening and closing the back cover, it was then not as tight as originally from the factory. I tried re-tightening the screws, putting loctite, nothing fixed it. The noise may also occur after a certain period of time without opening the back cover. I am not exactly sure what the grounding bar is or does but many owners found this to be annoying. Regarding this issue, some did not get a helpful fix from their support technician, some got a new MacBook Pro. I simply mask the problem. These modifications may void your warranty, consult your Apple Support technician before opening your MacBook Pro.
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