So the fridge is clearly struggling to get down to its desired temp of -22. Freezers should be working at below -15.
Though nothing has defrosted a 13 degree difference is substantial, these type of faults would normally suggest a door seal issue (cold air escaping), however if your not see alot of frost in and around the freezer its unlikely to be the culprit.
Next would be the thermostat, if its showing ambient is -22 and its actually -9, this could be the fault, where the freezer is getting mixed messages and unable to regulate the internal temperature correctly.
Failing that it could be the compressor and cooling system is starting to fail (but unlikely) its worth checking there is sufficient ventilation at the rear and sides, so its not overheating.
In terms of troubleshooting and resolution, I would start by checking the door seal is making good contact all around. Secondly I would check the rear and side of the freezer has sufficient room for air to circulate, and if they all come back as ok, I would look to get someone out to strip down the unit and test the thermostat and control board.
If you would like me to recomend someone to take a look at the freezer in your area, please provide you postcode.