a quick look at it it looks like you temporarily slip into and borrow from the natural minor
i.e. lets use C major, your V is G-B-D, the natural minor uses the subtonic Bb instead of B natural, this will give you your 'minor v' of G-Bb-D, also the implied key siggy uses an Eb and Ab so your submediant being a major VI makes sense here, Ab-C-Eb, this this context it reinforces that we are in a c minorish place for the time being.
the other alternative is similar but we look at it from an Eb major place vs C minor since we don't really see a i, it happens so quickly in your progression we would need more context to call it a true modulation, so my gut says we're just borrowing from the minor for sec.

