Dreaded oil leak

[Always@it]

Hi All -

Looking for advice on this one, would appreciate any help ! Thank you in advance.

Suspected failing vacuum pump & oil pressure switch - due to this-
Replaced switch (oem BMW) along with Front cover seal to vacuum pump & the o-ring to the cylinder head. (Parts from pelican parts)
After replacement all seemed good - pump & switch were clean & dry after lengthy test drive.
Next morning - pump & switch still dry with nickel size oil on floor on front passenger side.
Car has 70k - valve cover gasket replaced @ 45k
Out of ideas here
Thanks in advance for any & all help