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For a sink faucet I would try the following tests:
I hope the above information helps, if it does not please let me know.
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I am Bud - Your personal online "Plumbing Consultant"
WOW, 15 years...Probably so.. The spray diverter could also be stuck and not allowing water to flow either place, spout or spray. It should be in the body of the faucet behind the spout.