Your owner's manual will tell you all the maintenance requirements for your
vehicle. Each dealer puts different things in their maintenance services,
so you'll have to ask the individual dealer for a list of items serviced.
You shouldn't need to have the coolant changed. Hopefully, the dealer that
put the heads on offered to (or did replace) the spark plugs for the price
of the parts since you were so close to 60k and they already had them out
of the car. If not, you'll still need to do that.