What was the effect of Sandy? Was the boiler flooded?
Unfortunately, any boiler which has been submerged will have to be replaced. The electrical components, and gas train are immediately effected, and cannot be repaired, and the boiler sections may have been soaked with salty water, which will rapidly rot out the sections because of the chlorine. If this boiler has a more advanced design,with a stainless heat exchanger, then it too will start to rot.
Boilers and salt water don't get along.--NBC