I solved it by tearing out the entire ice box
Really, I cut out the inner shell, then cut the corner of the outter shell that was exposed in the aft lazzerette locker, and pulled out all the insulation with a claw hammer. I was left with most of the outter shell securely in place and all the cabinetry inside intact. I then glassed in a shelf, and stuck in a Waeco CoolMatic. I took the compressor off the bottom (which it comes from the factory with the idea that the installer can and probably will take it off and move it somewhere else) and glassed in a couple of tabs and hung it from the lazzerette locker's ceiling so nothing shound slam into it. This whole project made the necessary room to glass in a shelf for building a proper battery box. Now the area underneath the shelf that holds the new ice box, is used for storage, and I know I can dump something really wet down into there, and it'll drain into the bilge. The new box is so efficient, that it draws only 300 watts and runs off the solar panels during the day, batterys at night. I've had this arrangement for about 5 years now and it's worked well while living aboard and for a half dozen three day trips.
Kb