I suspect it is here, which is the same previous suspected location.
Remember, this is a stealth fighter and a pretty roomy one at that, so its gunport isn't going to be obvious like on a 4th gen aircraft (exposed) or on a small 5th gen aircraft like F-35A (bulges out).
However, compared to the prototypes the more posterior panels to the posterior gun door, that could be seen in the prototypes appear to be gone, so they may have redesigned the panels to be easily removable on the left side to maintain the gun.
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