Further status.....
Hard to judge due to the Polar vortex - temps have been in the low 20s to low 40s. We did however has one day up to 51, and I did notice a very small amount of condensation on the glass door, with maybe a little more usage on the condesner than normal. So I'm thinking main loading door seal now.
Below are some pics on the main door seal - it doesn't look too bad, but the access section for the wires looks a little funky to me. Thoughts anyone?