If it looks like the leak is from where the pump attaches to the main housing, there is a gasket there, but I couldnt' see it just going bad all of a sudden. Check that the bolts that hold it on are all tight.
The circular cover underneath the pump is a seal point also - there is no gasket/o-ring here, it's just metal on metal seal that has to keep in the hy tran. If you can spin it by hand, it's too loose - give it a good tap with a hammer to tighten it up in the hole.
On the bottom of the pump, where the suction tube enters, there is an male ORB to male JIC37. The O-ring could have given up on this, or the suction tube may have come loose - check to make sure everything's tight there. Careful taking this fitting loose or you can drain all of your hydro fluid out.
Last but not least, check the housing for stress cracks. It is aluminum, so some fatigue may have taken place and soem stress cracks may have occurred.
Just my
Good luck!
Nate