I don't think the phosphors are in any danger, as long as no liquid water got in there. That 15G RACS rebuild was a wreck and a half sitting around with no gun in it at all, and it's still working just fine to this day. If you wanted to be sure though you could cleave the gun out, then purge it with a slow flow of nitrogen over a few days to displace the air.
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Evolution...
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