Just to close this thread out....
Once home, I was able to reach under my fridge, clean the dust off the box under there and snap a photo. Yup, it's the converter....Progressive Dynamics PD9155. Why they felt the need to mount it almost 2 ft behind the front of the fridge is a mystery to me. Hard to get at, hard to test etc. For now I'm going to replace the house batteries and hope thats solves my problems before I try to have to figure out how to get the converter out of it's lair.
Thanks for everyone that responded.