Yes, that's it Dave. Mine had those small micro-cracks throughout both tanks. They said adding heat in the process of doing any repairs will make it all worse. I had a similar situation with multiple M38A1 radiator tanks in the past. The metal seems to get brittle with that much time and use (heating and cooling).
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1953 M37 CDN
1953 M38A1 CDN
1967 M38A1 CDN2
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