Seeing that the one tube is split I would suggest silphos. This brazing is used in refrigeration it requires the heat of oxy-acetelene but its magic. It fills voids and is a little easier than solder. Solder dosen't fill voids like a cracked tube. Solder works well with fittings but for something like a riser tube in a hole just poked in a header tube silphos is the one to use.
Randen
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