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Steam boiler loses water when off.
I have a one pipe steam system with Weil Mclain boiler. About 3-4 weeks ago I filled the boiler with fresh water to 3/4 of the glass tube. Today I noticed that water level dropped to 1/4 of the tube and the low water cut off light is on.
There must be a leak somewhere, but I am not sure where to start looking. I did a quick check of the return lines, but do not see any obvious signs of leaking. Any suggestions as to how to find it? Could it be inside the boiler?
Thank you in advance.