How can I fix a hole in 1 section of the boiler that drips water/steam?

I have a Crane 8-66A Boiler to heat my apartment building. One section of the boiler that looks like a radiator has a hole above the water line just over the first pilot- when the steam build up the 1st pilot goes out. Therefore, the heat does not come up. Can that section be replaced? Where can I find the part? I understand that Crane does not have the part anymore. It's a good boiler --just that one problem. The water from the hole in the 1st section over the pilot drips when the steam is up and put out the pilot. What can I do short of replacing the boiler?