2014 Grand Caravan ac heater control LED's out

3 of 6 of the LED's are out on the AC Heater control. Has anyone had this unit out and looked at it? I'm hoping it's just cold solder joints. We can order the whole unit but it is over $400. Thinking about getting a control unit for parts from a junkyard and making one good one out of two. Just looking for help from anyone with experience on this kind of problem. Thanks