Water line leak in GE refrigerator

I have a two year old GE Monogram side-by-side refrigerator (ZISS360DMCS) which has developed a leak somewhere in the water line which serves the ice maker and in-door water dispenser.
Water runs out of the refrigerator box in right rear corner, very close to the floor. The bottom surface of the box is made of sheet metal, and it is fitted with plastic grommets that protect tubing and bundles of electrical wires passing through the metal. The water drips out one of these grommets, right next to a bundle of wires. (Yes, the wires get wet!)
The leak is directly below the water filter cartridge, which is inside refrigerator compartment, in the upper right corner. I've never changed the cartridge, but there is still adequate pressure to the water dispenser and the ice cubes are not hollow. It's hard to imagine how replacing the cartridge would solve the problem. My guess is that there's a leak somewhere in the water filter's base assembly. Unfortunately, the water line connections to it are probably buried in the insulation, somewhere between the inner and outer shells of the refrigerator compartment. I'm a pretty handy guy, but not sure I want to tear apart the refrigerator compartment without being pretty sure of what I'm doing. Advice?
Mark Knight Arlington, VA
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