I know I had an issue like and it turned out it was a simple fix.
Any chance you cut the inside of the door out? If so, the interior light may NOT be turning off now, since a piece of plastic from the door was hitting the switch, and in doing so, that little light heats up the thermostat and keeps the fridge too warm.
I found this out after 4 months of fighting with foamy beer. Took the light out and foaming went away after a few days.