The above advice is assuming that the leak is prevalent when there is no weight on the tire...I had a similar very slow leak after changing my OEM rims for some Alufelgen wheels. Every week I had to put air into the tire and dunking it gave no indication of location. But put weight on the tire and it leaked about 10psi a week. Breaking the bead my shop found sand particles in the bead...cleaned it up and no issues since. Maybe something to consider.
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