My gut reaction is this, because this was "mounted sheet tile" marble mosaic,
I think you will find it was set in organic mastic by a " tile setter" instead of 
White mortar like a marble installer. I think what you are seeing is mastic bleed and the only true fix is demo and replacement
My two cents
Best regards
Scott Wilson

Sent from my iPad

On Dec 10, 2017, at 2:12 PM, Roger Konarski (via sccpartners list) <sccpartners@stoneandtilepros.simplelists.com> wrote:

I would appreciate any feed back on what possible is causing moisture on the shower floor. Plus the brown staining on wall and ceiling. Please see attached pictures.

Thanks,

Roger @ Restoration Stoneworks LLC  
 
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