Valley Pan, or hopefully something else.

[SlickGT1]

85k miles

So I found a dab of blue on my beige tiles in the garage. Said shit to myself, and measured out where the drip came from.

Looks to be the back of the engine. Damn.
Opened the expansion tank, nearly empty. Damn.
Added water and coolant.
Pulled out the floor jack, got under it, the transmission case has some serious caking going on. The reinforcement plate, by the oil filter same shit. Looks like oil might be leaking from somewhere, but it could just be the crud being washed off. Oil level is fine.

I can clearly see that the leak is coming from the somewhere outside the transmission housing. So I am praying that it is not coming from the place in this vid.

https://www.youtube.com/watch?v=F_gjFZJbAoE

Is there any other place that I can check, before concluding that the valey pan is the true culprit? I didn't have much time yesterday to look, I was going out, so did all this in a few min quickly.

Another thing to note. It almost seems to be a huge coincidence that this is hapening very shortly after I swapped all the front side coolant hoses, expansion tank tstat, the works. I did not replace just the backside heater core hoses, and I don't know why to be honest with you.

So my question, is it possible my 2 BAR cap is screwed up or something? Is it possible I messed something up during the expansion tank and hoses job?

Thanks all.