Hey, welcome back to posting
The trouble with draining an AG pool is liner shrinkage - the walls would still be sound. For an IG pool, you run the risk of it floating up out of the ground, if the ground water is sufficiently high. When liners are replaced, the pool dudes perform various acts of voodoo to keep the shell in the ground
You could probably get away with taking out ~ 2/3 of the water - which would be a good refreshening of the water while keeping the liner set. Make sure there are no issues, minerals, high CH or alk, with the water you'll be pumping back in!
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