Is it a steady leak or intermittent. If steady then it would most likely be in something pressurized----if intermittent then a drain pipe. HAve you removed drawers to see if you can see drain pipes and water pipes behind the cabinets? Anywhere there is a wall or divider there can be an access panel---look for screws on the corners etc; I can access my shower etc from my electrical panel--it basically is mounted on a door and when opened it exposes some panels I can remove-------look for anything like that. How about behind your furnace air intake?
I had a similar leak---it was the pee trap in the shower.
Good luck---let us know if any of this helps.
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