9 years, the liner's probably not going to want to stretch back into the pool after it's removed and rebuilt; you should count on getting a new one.
Do you think the blemish is rust under the finish - that could be trouble.
You may have trouble locating replacements for buried parts that don't pass muster - If you know where the pool came from, perhaps you can determine the availability of spares before you start.
The expense of installation may exceed the cost of a pool.