stevenal wrote:
Check the drain. Water should collect in a tray under the fins inside the fridge. From there it runs outside through the lower vent.
Bingo, the Only brand refer that has a self defrosting evap fin programming is Norcold. The fins defrost every 48 to 54 hours if the refer is in continous operation. The refer just shuts down for a few hours and this allows the fins to thaw and drain the ice build up. ICE is an insulator and degrades cooling performance. The volume of water is significant. Norcold's, the drain tube goes to a small cup beside the burner flue. The END of that tube has a very small check valve that prevents warm air to migrate up the tube to the interior of the refer. THAT check valve usually gets clogged over the years and does not drain hence the water backs up and overflowed into the refer. This link shows the hose and that very small black check valve on the one end is what you need to check. Doug
https://tweetys.com/norcold-622392-refrigerator-drain-tube.aspx?utm_term=&utm_campaign=&utm_source=adwords&utm_medium=ppc&hsa_ver=3&hsa_kw=&hsa_cam=17058388696&hsa_acc=1425045090&hsa_tgt=&hsa_ad=&hsa_net=adwords&hsa_grp=&hsa_src=x&hsa_mt=&gclid=Cj0KCQjw3eeXBhD7ARIsAHjssr-9vG7bntFUCFrSMoSifCf881RTwFYyxZsUtAYEaL-cZCZFTWhxcWYaAu7cEALw_wcB