Don't know for sure, you said it was about 1 year old, so it may still have enough stretch in it, the rest depends on the location of the leak, if you have to completely drain to get under the liner, I don't think reusing is an option since it will be nearly impossible to put the liner back in exactly the same spot in order to line up your drain, skimmer and return. Unless you don't mind putting a large patch over one of these items.

It must be a sizeable leak if you can hear it draining, that could mean some washout has ocurred, in which case, I'm guessing getting everything back in the exact place to line it all up again is going to be a very tough task and liner replacement sounds like the likely outcome.