The RML8555 is a Swedish built refer. Not like the other Dometic models assembled in the USA, from overseas parts. Because of the different style controls the 8555 uses, the parts are very expensive. And, I am surprised you could even find a optical inside panel to buy. Almost all the 8555 parts have been very hard to get and this was prior to Covid supply problems. I would install a 12 volt kill switch, disconnecting the 12 volts to the refer to shut the refer down. You could run the 2 wires to a switch inside by the refer. Doug