I just picked up this non-running soft today. I think it’s sat unused in a barn for many many years. I’d like to try and get it running, I think it might be a fairly low hour song. There’s a plastic plate that holds the air filter. I can’t figure out how that plate comes off to get to the carburetor? Also it seems like there’s a little corrosion under the paint on the bottom of the saw. Any idea what that might be? Not sure if I’m posting this in the right place