3 way norcold does not stay cool on DC while towing

I recently removed the Norcold unit and stove, but wouldn't recommend doing it unless you absolutely have to.  I have had an intermittent problem in that my new 2016 Silverado pickup has an alert bell that sounds occasionally (does it for the seat belts too and is very annoying) and warns me to check my trailer wiring, then it stops and says the trailer wiring is connected.   This has been both puzzling and annoying....  I have discussed this with others and gone to some great lengths trying to track the problem down inside/outside the trailer (e.g., checking wiring, butt splices, connections, probable rub points, wiring harnesses, etc.), including pulling the Norcold unit out and checking the wiring harness that runs behind and to the side of the unit.  

When I undid the screws along the front of the Norcold (piece of cake!) I also removed my screen door.  This really wasn't a major deal as the door has a couple of mounting screws holding it in place and one through the bottom door frame area and you basically just pull the door up (there is a screw on each side of the frame that serve as keepers of sorts for the door) and out carefully.  You will see the mounting grove opening and small track that is cut into the plastic side wall portion of the frame of the screen door should you decide to remove it.  

I also had to remove the stove top as this needs to be done to get to the propane line on the fridge (which you need to unhook) and this really wasn't a major issue either as my stove was held in place with four corner-screws and when removed the stove lifts out easily and I was able to do so without unhooking the propane line.  

Note - The Norcold unit WILL NOT budge after removing the front screws along the face of the unit, etc. and WILL APPEAR to be held in place by clips, etc. but it is definitely not.....  The vent piping is solid steel and holds the Norcold in place like the rock of Gibraltar!  

The biggest issue in this entire task relates to the front fridge exhaust vents on the front of the trailer.  It's VERY EASY to unscrew the vent screws as this will now release the Norcold unit (it almost gives off a sigh after unscrewing the vent screws!  - Just kidding!) and allows you to easily slide/remove the Norcold unit out from the cabinet area.  However when it goes back into place, this is where all the fun begins.  Aligning, fastening and screwing the Norcold unit back onto the vent pipes is a swift pain in the butt and I will admit that a second helper on site (would be an enormous help) might have helped out some and allowed me to get the venting installed much easier.  

For one thing I could see from the factory's initial Norcold install that the screws did take them some time to install and mount the Norcold unit flush against the vent pipes.  One of the front screws was off on a slight angle so I ended up struggling with it until I got it back into the proper alignment and after alignment was made I was able to screw the exhaust piping in place tight.  I also had to open the trailers front window, reach in and use my arm to pull the unit into place, get both ends of Norcold piping aligned with the screw threads and secure the Norcold unit into place once and for all.  This can be accomplished, but this area is a tight fit, the piping is rigid and there is no give to it and this portion of the task requires patience, proper alignment, some precision and some stamina.  

As noted above, you will scratch your head in frustration if you think the Norcold unit is easily coming out in the initial phase of unscrewing it from the front of the cabinet as there is a bit more to this task than that.