Underdog

Maybe you can get creative in where you look.
Maybe you could cut out the bottom of the cabinet right there.
You could repair it without losing anything cosmetically since it's inside the cabinet.
If nothing shows immediately next to it, what could be leaking?
Most people would never notice the stain but it's too uniform to be nothing I guess.

olliegrl

This is why I'm calling someone. I don't wanna cut out my cabinet cause I use it.

Underdog

Sorry, didn't mean the whole cabinet, usually the floor of a cabinet can be repaired with no real ill effects.
The cabinet is the closest area to the stain.