The cracks are areas of tension where the pads are pulling away from each other due to the shrinkage.

Depending on the type of natural stone you are trying to match, it can be easy to match or more difficult to match.

If water from your shower is leaking into a crawl space the problem is not the cementitious grout joints. There has to be an underlying problem with the shower pan’s waterproof membrane.

The method you use to re-polish a tile surface depends on what kind of tile you have. You can’t use a chemical by itself to polish a tile.

The first question is why did the tiles come loose? If installed correctly tiles should not come loose.

First of all if it was installed correctly you wouldn’t have a problem. To fully figure it out I would have to perform a forensic intrusive inspection, which probably isn’t practical for a small shower.

Hollow sounding tile is not a defect per industry standards.

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Patching the grout joints to stop the leak is a band aide approach. It does not fix the problem, rather it is only fixing the symptom of the problem.

First of all a hollow sounding marble floor is not considered a defect in itself. It could be a symptom of a defect.