I don't think that there is a way to get the "check engine" light to go away, for this issue. The only thing I can suggest, if you haven't already done so, is replace the plugs and swap the coils, as mentioned earlier in this Thread. Just in case the Dealer's diagnosis is not correct. Other than that, good luck. You might be able to get the head replaced for less at an independent shop. Usually, with the "defective head" problem, an engine will set other DTCs and run a bit rough.
The Service Manual also states:A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect for the following possible sources:
-A tire or wheel that is out of round or out of balance.
-Variable thickness brake rotors.
-An unbalanced drive shaft.
-Certain rough road conditions.
-A damaged accessory drive component or belt.
-A damaged reluctor wheel.
Obviously most, or none, of those would apply to your case. It is just to show you that, unless you really trust the Dealer, it doesn't hurt to check other possible causes.