origin leaking at fill port. How to fix?
Drain air, remove fill port, repair.
It has a check ball in it. It can be pretty fussy to get to seal up for sure.
I put a very small oring under the check ball in mine with some silicone oil and it sealed up
you wouldn’t happen to have some pictures would you?
I don't have one with the check ball out and the one I have showing where it's at is to big of a file to post here. Trying to figure it out now lol.
Maybe go to the FB Origin group and I can post it there for you.
The check ball is really small so don't loose it if you take it apart.
A friend of mine in the Origin FB group had the same problem and was able the use the needle valve from a small engine carburetor. Some of them have a rubber tip on them. I think he changed the spring also but not sure.

