Noticed the left rear pressure very gradually getting lower than the others which are perfect consistent usually...figured I picked up a nail or screw and sure enough. Had punctures fixed before and I know it's fixable if it's in the tread. Figured I'd throw this out there since some of you might have had it or are in the know with tire service. Looks like it's in a fixable spot but I was curious if anybody else thinks the same. Leak is very slow and I was going to go to the tire shop later this week.

Its an Fsport 18" wheel if it matters, tire still has plenty of life in it still

 

That puncture is absolutely fixable and the best method would be to patch it from the inside.
The tire would have to be removed to patch it.
Easy alternative is to plug it...not as good as a patch, but will work.