Or any other recommendations that this issue could be?
I managed to run the test mode with fridge off and force freezer on and finally the freezer started to work (top of the evap started to get frosted and left for a good 8 hours and freezer reported it was at -24 (target temp). Whilst definitely now cold, didn’t quite feel like that but no thermometer to confirm this. That suggests the TDM may indeed be working and just needs a re-gas I believe. Are there any other opinions on this?