Since nobody else has chimed in yet I'll give it my best guess. At 6 years you probably can't salvage the liner. Others that work on these for a living have better advice. As for the main drain, someone in another thread mentioned that main drains in an AG pool are a bad deal. The comment was that by sloping the bottom toward the middle the dirt will tend to settle in the middle and can be vacuumed out easily. Personally, I wouldn't have a main drain....period, in any kind of pool. Over the years on this site I have read a lot about all the trouble they can be.
Al
Edit: Here is that thread about main drains.
http://www.poolforum.com/pf2/showthread.php?t=7288
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