Tech thread has very detailed pictures on the innards of the solenoid. Check the orings that seems around an area with some moving parts if I'm not mistaken.
Geo noids also have that really complex ring seal pressed against the inside of the body. if you took it apart recently to clean it it may be crimped or misplaced.
I must not fear. Fear is the mind-killer.
Fear is the little-death that brings total obliteration.
I will face my fear. I will permit it to pass over me and through me.
And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain.