9 psi overnight is not a slow leak. thats a pretty fast leak. 9 psi over a month is a slow leak. best thing to do is to take it to a reputable tire shop. they will dunk it in a large tank of soapy water and should be able to find the leak. I used to work in a tire shop and you wouldnt believe the things we found that caused leaks. valve stems, objects in the tire, bead leaks, even once saw a wheel with a porosity leak (as grumpyolddude mentioned) but those are VERY rare. another time I pulled a staple (not a heavy duty packing staple, but a regular one just like in your average desktop stapler) out of a tire. took me an hour to find this thing, lady swore up and down there was something causing the tire to lose 3 psi a month. I was almost equally sure she was wrong, until I finally spotted the staple and one tiny little bubble.
anyway, with a 9 psi overnight leak, Im sure a good tire tech will find it.
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