Twin 7.4L bravo drives, had the drives serviced at winterization in the fall. Reputable marina.

Unwrapped the boat and both reservoir bottles are low...port is practically empty.
looked around the port drive and found oil. not sure where the leak is (working on it) but it seems to be from the lower of the top two bolts on the right side, just below the oil vent screw. Wasn't quite sure if it's the screw or the bolt...
i have some paper towel there now to try to pinpoint the leak- figure wherever on the paper the oil is, that's the spot.
So, is it possible to leak from the bolt ? Is there a gasket that maybe got mangled when they rehung the drive at service? Seems odd... no pressure just gravity pulling oil out (does that make sense?)
Is it typical for the drives to suck some oil from the reservoirs after service? Hoping the starboard drop is just typical after service... the port leak is bugging me.

make no mistake I'm going to call the marina, but it's spring...corona shutdown.... etc, could be a while before they look at it. .. if I can solve it myself I'd like to.
Thanks
PK

Gasket on plug leaking?
Left over oil from plug being removed during service?
Reservoirs low from air bubble burping out over winter?
Just some guesses.
I would cleaned it off, top the reservoirs and watch it.

I removed the plug and there is no gasket.
hopefully it's an easy one to find
thanks
pk

Think it’s same as gasket on drain plug behind prop. Easy to get at any marina.

It is 99% the washer/seal for the upper plug. No where else in that area can leak gear lube. I would call your "reputable marina" and have them look at it and fix it.

Forgot to mention, that gasket usually sticks in the housing and does not come out on the plug.