Repair Leaking Shower Through Regrouting
Found this useful resource for owners to repair a leaking shower which may be due to damaged grout. They talk about how cracked or crumbling grout can lead to returning mould and moisture which can be an indicator of grout failure.
The process can involve removal of old grout, vacuuming of trapped moisture and the application of two-part epoxy to suitable showers.
If your shower is showing signs of moisture or deteriorated grout, look further into the service information to see whether regrouting can help you repair leaking shower problems.
https://www.saveandseal.com.au/shower-re-grouting