Oil Leak on Engine Oil Tank

[JR'S Z/28 Texas]

Good Evening All! I have a New to Me another 2014 Z/28 #305 Red with A/C. When I was servicing, Engine Oil & Filter Change and a lot of checking and looking. I have a 2 post lift now.
When removing the Under Engine Cover I noticed a Oily Mess that couldn't be seen from the top.
What I found is a Oil Seep at the Oil Tank at #8 & #11! Chevrolet says Any O-Rings for this is NON SERVICEABLE and that I would have to buy the Oil Tank at $1800+!! part# 12611804. yes I have found some for less $$.
Has anyone else had this problem?
Yes I Will take it apart and try lots of things before I pay GM's price.
Thanks JR

[bsn]

I think I would take it apart and see what you have first. GM may not service-it replacing it as a complete unit but it doesn't mean it can't be done. If not a good machine shop could be able to come up with a solution.