Yesterday I had the opportunity to do my 42K-mile oil change and tire rotation. While I had the car elevated I snapped a couple of pix to illustrate the relationship of the tranny, oil pan, and the "belly pan".
First, note that the electrical connector associated with the leaky tranny O-ring problem is not even in the picture. It is off the frame to the left.
Second, note that the "belly pan" ends at the crossmember.
Third, note that the joint between the tranny and the oil pan is several inches to the rear of the rear edge of the "belly pan", so any leak between them would not land on the "belly pan", but directly on the floor.
Now then, if you are saying "bellypan" and meaning "oil pan" then there could be a leak between the tranny and the oil pan, or an engine oil leak between the bottom of the engine block and the top of the oil pan, which would not hit the "belly pan" and/or could be blown by air flow rearward, and eventually drip from the car onto the floor somewhere rearward of the "belly pan".
As can be imaged by looking at the relationship of the tranny, oil pan, and the crossmember (while keeping in mind that the oil pan has the bottom half of the crankshaft filling its interior) if the leak is between the tranny and the oil pan, or between the oil pan and the engine block, and the stealership intends to remove the oil pan and "put some special oilproof silicone around the bellypan" (actually the oil pan) they are in for a
MAJOR effort, which usually equates to major $$$.$$.
Keep us informed of their progress. And good luck!