When we first got our new to us 39Z we checked the recall notices and there were several for the Norcold.
From what I have read, the issue of fires has been resolved, but if the unit is not level it can overheat and ruin the refrigerator even if it has been updated. If the recall updates have not been installed, you could be looking at a motorhome fire.
Check out
https://www.arprv.com for more information, and do a search on Norcold recall. We bought our 2008 Journey in 2014 and had the dealer do 2 updates for fire issues in the first year.
I don't know if I trust Norcold to have 'fixed' the issue completely. We use the inverter while traveling and turn the fridge off when not level. Why not be safe?
Jengle