Unknown Oil Leak after repairs

[VegasMatt]

Hello all. So, I just had my 2014 5.3 in the shop and had the rear main seal, valve cover gaskets, and oil pan gasket all replaced due to small oil leaks starting. Problem is, I still have a leak. I noticed oil on the bell housing and it seems as if it is coming from the rear of head gasket on the passenger side. Possibly leaking down onto the plastic cover attached to the bell housing and then onto the housing it self. I can't really find much about head gaskets leaking oil so just wanted to see if anyone has any ideas as to my problem. I've attached a couple pictures showing the tab with oil on it and the bell housing under.  Thanks