When my GE Monogram refrigerator was not freezing cold enough (27F rather than 0F in the freezer), and was also very hot on top, I found many other posts of this same problem without a solution. I cleaned the condenser coils with a brush but that was not enough. This was a mystery until I found the post below. Miraculously, some water in a spray bottle solves the problem. I think that the coils are just so tight that a small amount of dust plugs them up. I hope this is helpful to others, as I rely on the internet for my home fixes.
www.applianceblog.com/mainfor...
From that post:
Tech came out today... problem was embarrassingly simple: the condenser coil was clogged with dust! It looked clean and dust free from the front, but the passages were apparently clogged up (hard to see from the front as they are perpendicular). The tech used a spray bottle to clean them out, and immediately it began working. Symptoms he mentioned that were a giveaway were 1) lots of heat on the right side of the cabinet, 2) not much air flow on the left side, 3) very hot copper pipes, and 4) lots of heat along the left vertical side of the freezer where the copper pipes go down thru the frame. A secondary issue was that the fridge thermostat was likely not working well - he replaced it.
He suggested using the spray bottle technique once or twice a year as a preventative measure.
Live and learn!