Why is my refrigerator not cooling properly after a power cut?

My power breaker in the kitchen tripped... not due to the fridge but due to something else I plugged into the circuit. Around 5 hours after resetting the breaker I went to get some ice-cream and discovered my fridge apparently didn't actually kick back in. I unplugged it and then plugged it back in and it came back on, however, it is not getting as cold as it used to. Some stuff in the freezer is still frozen solid, however, other things have thawed... all the stuff is still quite cold, just not freezing. The refrigerator compartment is cold... but not as cold as it should be either.

I have checked a number of things, including cleaning the coils under the fridge, ensuring the fan is running, checked for ice build up... still not getting as cold as it was just before the breaker tripped. This fridge has had no problems at all up until this time so I am really confused how a breaker tripping broke my fridge! This is an old fridge, the date printed on the back says 1997, however, I can find no actual model or make information anywhere... the fridge itself is also in great condition and has been working perfectly until now!

Does anyone have any suggestions on what else I can check? Thanks!