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This section of pipe has looked the same for a few years (perhaps the whole time I’ve lived here)Never seen visible leak or dampness. So am not sure if this is a leak or impending leak……does this warrant a plumber visit to replace section of pipe?

Thanks all. Much appreciated.enter image description here

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Looks like the flux from soldering was not cleaned off throughly, and then the pipe was painted.

Scrub it clean (which will take poorly attached paint) and possibly use a bit of sodium bicarbonate to neutralize any remaining excess acid from the flux, then rinse, then (if desired) repaint (or don't if not desired.)

No plumber should be required.

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