Good luck with that "warranty".you are the one who said "no". Did you look it up at all? https://scubapro.johnsonoutdoors.com/us/scubapro-warranty
There are so many conditions that have to be met: Must be bought new from a SP dealer in the US; Must have original receipt; Must be registered with SP after purchase; Must be bought within a specific time frame.
Hey, you never know. First for everything. I wish the poster with his 30+ yr old second-hand BCD much luck.
I'll stick with my 'no'.