Dometic rm2552 intermittent heating on AC power?

[Jeeprider392]

Hello all I am new to the forms but not new to RVs. I have a 1998 Coachmen Catalina with a Dometic rm2552 Fridge. Running it on AC power. Over the past few weeks, it will be working totally fine, and then suddenly stop working for a few days, and then start working again. I have verified there's 120 volts going to the heating element & the heating element reads 63 ohms. I'm wondering where I should go next. The RV is sitting perfectly level. I was thinking of removing the thermostat switch (the knob with 1 through 7 and MAX on it) and testing it but I have to remove the entire fridge to remove said switch and get to the terminals on it. Any ideas?