Was having issues with defrost system so I replaced heater (which was broken) thermostat and timer. Before entire coil unit was frosted over. Now it is just maybe the bottom row (4-5 Coils) and its a solid block of ice? I also replaced the icemaker nipple assembly and saw that it was dripping water. I have completely defrosted again should I just wait and see or would something else be causing this? Also when I look at the manual for this should the heater be on top of both coils or top and bottom of lower one? I currently have it on top of each coming down. Any ideas would be greatly appreciated.

That makes sense that is why top coils are staying clear and bottom ones are not. Think I have learned alot on here thanks again for your help.:)