Haven’t heard of many upper pan gaskets going bad, the FPG by three bond we use is pretty strong.. I see you were in your T-belt area recently, you didn’t happen to check your camshaft seals for leaks did you?
That’s a common area that makes it look like the upper pan is leaking. There is also an updated seal for those that goes from the old black seal to a new brown seal. Double check before you take on the project
Oil is splashing like crazy the pressure inside is going to look for escape and that’s where it found it, add a belt spinning at various revolutions per minute and we get to where we are now. We get them here at the dealer often. Well.. used to.. I hope they’re not as hard as a rock or you’re in for some fun!! With that being said also make sure your pcv valve is working correctly! Please do me a favor and change all three seals. Cam and crank. I was like you once. Didn’t change them then had to go back in; do the job once then enjoy her without issue, then you’ll fall in love her reliability!
If we’re talking about aftermarket. I’ve heard companies like Apex, beck/Arnley, gates, and mahle are good and rebox factory parts. Try to find a brown one, but if you can’t new is new, don’t think you’ll have a problem for a while unless you damage it during installation.
For the oil pump housing most likely, I’ve forgotten, you just need that seal though. The crank seal is the same procedure as the cam seals just lower. As always take precaution to not scratch the journals, if you want to attempt it with a tool I would recommend lisle tool #58430 it will still be a pain though if it’s as hard as a rock unfortunately