While you're obsessing over where the screws are placed, have you considered the previous owner, at some point overfilled the reservoir and kept it so. Yes, THAT system may be toasted due to poor maintenance/service by the previous owner. Anyone who buys something based on price alone will be forever working on it or it'll be in a shop. There's usually a reason why someone wants to dump it. Your primary job is to determine why. These systems, when operating correctly, are awesome. They are expensive to fix if the are not. Choose wisely....Dennis
