Yup bring a square tip on the roof and remove the cover to check that there is not a big gap of open space next to the fins. My fridge ran warm and it turned out my clearances were OK.
Problem for me was lack of airflow behind the fridge. It comes with a tiny fan but its not enough on hot days. My manual even has a section about adding another fan to help blow the hot air out of the roof vent.
I ended up with 4 12v fans.
1 large (4") fan is behind the fridge to blow the hot air out. I only use that in the summer.
2 fans blow at the cooling fins inside the fridge.
1 fan sits in the middle of the fridge to circulate that air.
Mine are Noctua brand and come with adapters to reduce the RPM. For me the biggest help was adding a fan to blow at the cooling fins inside the fridge.