Over heating cos they forgot something

Got my bike back from a major service at on two wheels in penrith on sat. Riding to work this morning and look down at a blink temp gauge cos of over heating. This is just after sitting on the M4 exit ramp for 20 minutes! so likely 20 minutes at something over 118C which is all the display goes upto before its gets all friendly and just say HI to you. Get the bike home tonight to find not enough coolant, barely enough oil (which is already a light brown) and the fan cable swinging merily, not connected. Getting them to fix it all just for the sake of teaching them to be more careful and not so stingy on the fluids. Anyway, the questions is, besides opening the engine up and looking inside, what kind of things should I be on the look out for that could be signs of damage from this heat? Or is it that I will probably just have to replace my rings or something earlier?