I have a 14 year old 24' round above ground Vogue steel pool. I discovered a rust hole at the base of pool and water had undermined the sand from under the liner around a 1ft section. I removed the liner and I'm debating whether or not to repair the rust and put in a new liner or tear down the pool. When I removed the liner I could see several other places where there is rust. Last summer I put a steel patch around the skimmer. What guidelines should I use to determine if the pool is repairable and to determine if it will be safe?