SMed08

Strange one. After some heavy rain, noticed a small dribble of water coming from the tow-away button between the vanity lights. But strange thing is I have no sunroof at all.

Could this be related to a possible windshield leak?

rapidoxidation

When's the last time you had your windshield replaced?

SMed08

Never as far as I'm aware

rapidoxidation

Any cracks that go to the top edge of the windshield?

SMed08

None

rapidoxidation

do you have little flaps on the 4 corners of the roof that lift up to reveal mounting points for a roof rack? If so, try flooding each one individually (keeping the rest of the roof as dry as possible) to see if water is getting in that way.

SMed08

Ah yes, good call. I'll check that out, thanks.

Assuming that is the problem, how would that even get sorted? Headliner off job?

rapidoxidation

Easy way? Silicone, liberally applied. You might even be able to see a crack using a strong light and magnifying glass.
Right way? Pull the headliner and observe the path water is taking from outside to inside and take action from there
You might get away with just putting some sealer on the proper sized screws and filling the sockets you'll see under the flaps.