Flat tire on my FX two days in a row

Went to my garage yesterday to pull out the FX and immediately noticed the back left tire was flat on the ground. I checked and it had 8 PSI of air left. I checked the whole tire and no nails at all atleast nothing I can see.

Any idea what it could be? When I drove it last Sunday there were no air leaks. This just showed up yesterday. I filled it back up to 34 psi and went outside this morning and it was flat again. Is the tire damaged from sitting flat on the ground or can I just go and get it fixed? Any idea whats wrong or could be causing it?
 
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could be leking from the rim. fill it back up and get high concentration of soap and water in a spray bottle and spray everyting
 
Fill it up again and check it for leaks with a real soapy water solution. Make sure to also check around the valve stem.
lol, looks like Andrew and I posted the same answer at the same time.
 
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Probably hit a pot hole and a tiny leak through a slight bent rim or there is a nail or something u haven't found yet.

I told you the FX was going to be pissed at you.
 
Haven't hit any pot holes cause I haven't been driving it. When I took it out on Sunday it was around the block a few times. No rims bent either. Gonna take the wheel off to see if there is anything I haven't seen.
 
could possibly be that the lip of the rims had salt sitting on it and over the winter it started pitting the aluminum area where the tire meets.
 
I had this happen on my truck. Couldnt find a nail couldnt see a leak on the rim lip.

Pulled the wheel off and I had a nail on the inner lip. Sometimes you just can't see it.

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And when I say truck, I mean my pickup. Not the FX.
 
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