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This shut off valve for my cold water started dripping very slowly last night after I closed it to replace a cartridge in my bathtub. It’s dripping maybe a drop every few minutes. Is this something I could fix myself or should I get a professional? I think it’s just valve part that needs replacing but I’ve done nothing with metal pipework. The sum total of my plumbing experience is replacing a sink, a toilet, and the Moen cartridge I did last night. Any advice?