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You might need to have it recoated if it's 16 years old - I'd send the optics off to the USA to get a 98-99% reflectivity dialectic coating (that would be like adding a inch or two of glass (based on standard Si02 protected Aluminium mid 80s reflectivity). It'll probably be pretty mucky and thin , and probably badly pitted too.
You might also consider asking for the figure to be checked (Nova Optical perhaps - will give you a super mirror in the end , do that fist ....).
Sounds like a nice find nonetheless as all the above are eminently fixable.
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