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Any thoughts on what would have caused the sealant between the 1st and 2nd section to fail? Or is that the 2nd & 3rd? No idea how long its been like this but the boiler was installed around 2010. My guess is this has been a long standing issue and that since the boiler is used for steam heat & hot water, it is running year round, the water was evaporating off the side of the boiler before leaking to the ground. So nobody noticed until work was being done in there recently and they shut off the boiler for a day to cool the room.
Looks like a fun fix.