I came across some corrosion on a copper hot water line in our house:
Is this a potential early warning sign of impending pipe failure?
I did some research online and came across multiple contradicting hear-say-comments ranging from "this is caused by left-over solder flux, it doesn't matter" all the way to "there likely is already a leak and it'll probably get worse quick!".
If this is an issue that warrants pipe replacement, do I need to cut off all of the corrosion (might be a bit difficult in the front pipe as it disappears through a beam) or is it enough to clean it off with some steel wool?