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Well considering the options available I think you should try a radical approach.
If I had a 15G in the condition you have, I would try this:
Build a box the tube can fit in comfortably, make it capable of sealing, vacuum tight, and make it heat resistant to 300 degrees f. Metal box??? Glass???
Put ac air conditioner fitting on it, and get a cheap deep cycle vacuum pump. and good digital gauge. $400. you could resell later.
Seal it up and apply vacuum and be sure it holds vacuum for a few days with no leaks.
Then for a period of one year keep a full deep vacuum 200 microns of less, and keep it heated at least 200 degrees to get out any water vapors.
After one year of this treatment remove the tube and test it, if there is significant improvement then seal it with that vacseal at all known leak points.
If no improvement oh-well it was dead anyway.
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Yes you can call me "Squirrel boy"
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