My 2016 2351 has the new 4 Way Water Distribution Panel and my fill valve was not properly doing its job as intended (hooked up to City position, water would continue into my PC and flow out of the overflow on the passenger side of PC - other camper's will quickly point out the leaking water flow).
Calling Kermit, he graciously sent me a new assembly with encouragement to replace the old assembly by way of the bottom drawer of my closet on the driver's side, remove the panel behind the drawer and then disconnect the 5-connection of the old assembly, unscrew the assembly on the outside (8 screws) and then simply reverse the process installing the new assembly
Thankfully that process was not available to me unless I broke down my extended bed so that I could get the drawer out without taking the drawer apart.
The 4 Way Water Distribution Panel is made by Anderson Brass along with many other products and they have an UTube installation of their 200-RV-RK valve, which is done completely on the outside without removing anything other than the valve itself. Go to Anderson Brass website, go down to "Products" down to "RV Products" and click to the right on "RV Water Service Panels" and you will see the panel that looks much like the new 4 Way Water Distribution Panel that PC used for my 2016. At the bottom of that page is a "Repair Kit Video" (does not have verbal instruction) for replacing the valve. Please pay particular attention to the 3 full 360 turns of the set screw. You may believe that you have turned it enough and it will soon fall out and be lost, but I found in removing the old valve and replacing of the new, that without the set screw more than flush (3 full turns) with the inside of the assembly the old valve could not be removed and the new did not slide far enough in to complete installation.
Anderson Brass uses a distributor for the assembly, Champion Energy 972-228-4341 and you can order the assembly or my suggestion, just the valve (200-RV-RK) at Fitzilla.com. The assembly is about $90 and the 200-RV-RK is about $30.
Of course if close to under warranty, I expect Kermit will send you a new assembly, much like I received, but consider just removing the 200-RV valve if armed with the suggested Repair Kit video.
Hopefully few will have this issue.