Unplugging and replugging the top module worked... Until it didn't a couple minutes later. Curiously, when I opened the freezer side, it didn't blink, and then when I opened the fridge side it was okay too. When I closed both doors, it stayed fixed... Until it wasn't. The fridge is 10 years old and we're getting ready to move out. So at this point the flicker is a quick couple of flashes and minor annoyance to be ignored... For now.