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Sorry but IME the only way to fix something like that is to tear everything out, let it dry and then build a new bathroom. Water ingress into the surrounding structures leading to subsequent mold etc. Is it a wooden floor/ceiling where this is happening? I mean joists and things. If it's concrete you might be in better luck.
Is there a clever way of tracing a tiny leak backwards? Our built-in shower (no idea of construction underneath the tiles) is leaking through to the ceiling below. Only a few drops at the moment but it’s getting worse...