GE Model PDS22MBRABB bottom mount

Fridge warm had frosted evap. short LINE & DEFR. on main board (adaptive and control in one). No defrost initiated. tech <GE now Mabe> manual says replace board. check out evap. thermist ohm out in speck temp chart.
Return w/part four days later. Know compressor running defrost heater on at same time?
Replace board <redesigned separate ground+remove groung from relay as tech sheet says> Run 48 hrs OK 72 hrs later fridge warm, freezer cold and making ice???
Air damp. suspect but @ a loss if not the problem. Tech manual didn't quite make the translatin from english to english.
Have you had the same problem? Wow I am beginning to miss the regular mechanical defrost timers and bi-metal therms <evap>
Thanks in advance Chuck