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If you have that much corrosion on the unit I would say I would not mess with it. You are dealing with a sealed system leak and this would be involved and expensive to repair. You would need gauges, freon, vacuum pump etc... to do the job. I would say you are better off scrapping the unit. IF the sealed system was contaminated by water or anything you will have additional issues as well. Those units once that far gone are better off headed to the scrap yard as they will nickel and dime you after this to death.
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