Clay Smith wrote:

My cooling unit also sprung a leak on my Norcold N841 after 11 years of use. So I replaced the cooling unit at about half the cost of a new refer with an Amish cooling unit.
While the refer was out I also saw the opportunity to improve the insulation around it.
What I had found in the hardware stores was the water-heater insulation blankets that happen to measure 48" wide by 76" tall and consists of 2 inches of fiber glass with plastic on one side. I got one and cut it right down the middle and stapled each half onto the sides of the cabinet walls. Plus, being that each piece was 76 inches tall, the extra was able to be utilized above the refer. The insulation naturally fluffed out from the walls, but having the plastic protecting it, it pushed right into place when we pushed the refer back into the opening.
Also while the refer was out, I went to a sheet-metal shop, and had a piece of sheet-metal cut & bent to go onto the outside wall from the top of the outside access, to the ceiling. The width of the sheet-metal was sized so that when the sides where bent in 90 degrees, the width matched the width of the refer. And when the refer slid into place, it slid about an inch pass the edge of the sheet-metal. Then I finished out with more sheet-metal from the top-rear of the refer to the roof vent, plus the sides inside of the outside access.