2014 S60 R-Design Maintenance Question

[cinematree]

This is the 3.0 T6 with the Polestar Chip. It's at around 80,000 miles and I haven't had any engine issues (knock on wood). I had the regular maintenances done until the 60,000 one, and then just oil changes. Volvo's 60,000 maintenance states "Some vehicles will require replacement of the spark plugs."

Is it a good idea to change the spark plugs? Or better to ask a mechanic to remove one and determine if they need changing?

And also a good idea to do a radiator flush?

Anything else? Engine air filter?