I have a shower, with a swing out alumax shower door, the sweep feel apart.

The bottom of the shower door enclosure has been leaking. The top of the curb

Is a clay or cement material which is wet. The wall board below the is wet and the tlie has

Fallen off.

What do I replace the clay or cement material with. Once this is done I can put the tile back.

Thank you

You may be able to repair that with a thinset mortar.
I have to do just about an identical repair in the next week or 2 and I don't know yet what approach I'll take until I start taking tiles off and seeing how bad the damage actually is.