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This is all from memory so if I do not get every bit right don't ding me too much.
The "issue" with older aluminum tanks was limited to 6351 alloy from Faber. All those tanks were produced prior to January of 1988 or 1989.
Apparently only 3 or 4 tanks out of several million produced have failed catastrophically too date. .
Find a dive shop that actually understands the tank. They can be filled as long as they have the proper inspections. "Can't be filled" is a shop policy not a leagal requirment.
I won't fill them, no matter what's stamped on them or who VE'd them or how new they look.
This makes me an unknowledgable jerk, I know that.
I don't care.
All the best, James