Because if its coming from there then you need to replace the compressor... $$$$$$$$$$

Are you $600 confident its coming from there? If so, replace it and see if the squeak goes away. Don't know what else to tell ya other than what I already did.... I'd spend $15 on an automotive stethoscope to be 100% certain that's the true origin of the noise because its not a cheap fix. Actually, its winter.... I bet They make an AC delete kit that would be cheaper...