Congratulations on your purchase of the best headset money can buy!
Chris King headsets are covered by a 5 year warranty. Besides the occasional adjustment, the only service required is an occasional cleaning and regreasing of the bearings. In wet conditions, service may be needed as often as every 6 months, and in dryer conditions, every 5 years.
Water is the most common cause of problems with any sealed bearing. And when water enters the frame through breather or other holes it can work it's way to the head tube and eventually to the headset bearings. High pressure spray washing, transporting or riding the bicycle in the rain, or submersion in water can lead to this condition. Your headsets stainless steel bearings will resist corrosion, but the grease will eventually deteriorate.
If when servicing your bearings you encounter damage, these are the kits you'll need to replace Snaprings, Seals, the Bearing Cap O-Ring, Scuff Washers and the RingDrive Lube is perfect for lubricating any bearings.
As always, consult the owners manual that came with your headset, or visit the Chris King website for questions and procedures.