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Can you define what you mean by liner?

If this is a gut job of the shower, you'll want to look into the Schluter system for waterproofing and slope setting. It will be superior to what you currently have.

I was referring to a waterproofing liner. I have seen some info on the Schluter system. I will look into it. Thanks!

Schluter is excellent and has a lot of different products to use for a complete system of waterproofing. We just used Schulter products for a total master bath renovation that had to be done due to a slit the previous installer cut in the bottom of our shower liner. It took a long time for us to realize what was leaking, but once we did, the damage was extensive, and we had to gut to the studs in two rooms. You don't want a leak happening again simply due to inferior waterproofing methods. If you are in the Dallas area by any chance, we used Trinity Flooring which specializes in this system.

There is no repair. Just replace. https://www.ceramictilefoundation.org/homeowners-guide-to-hiring-qualified-tile-installer