I have a Danby apartment-sized fridge/freezer, and the main fridge compartment is icing up with crystals near the top, but there's also lots of condensation on the ceiling of the fridge compartment. The freezer appears to be working normal. The water collection tray at the back is full. One technician came to look at it, and couldn't find "the other" air vent, then ghosted on me (when he decided it wouldn't be an easy fix?).
Any suggestions? The unit is about 5 years old and is generally in good condition, apart from this problem which started a month or two ago.
I've attached some pictures, also viewable here: https://imgur.com/gallery/NQTusEd
Any advice is greatly appreciated.