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Help with leaking copper tube boiler
I have an old Raypak Raytherm 168-T boiler with a copper tube heat exchanger. The seals between the tubes and the headers of the heat exchanger are starting to leak and I'm having trouble locating replacements. Raypak's website shows this boiler as being obsolete since 1975 and I get the feeling they weren't too popular - no one seems to have any info on this particular model number. Google also turned up nothing. I'm hoping someone here may be able to help.
Alternatively, I've come across a few of these stop-leak sealing products for hydronic systems. Anybody have any luck with these? I've never been a fan of band-aid solutions, but I only need this system to last one more winter, if possible.
If it's worth anything, here is a picture of the back-side of the leaky header: