State that the origin is unknown and describe the location, timing and fixtures used. Do not label it a pump-casing leak without evidence.
What the observation means
Supply pipes, toilet fittings and wastewater connections can all be nearby. Touching or dismantling wet equipment to identify the source is unsafe.
A useful next step
Stop using affected fixtures and keep people away from contaminated or electrical areas. Obtain assessment and retain safe existing photographs if useful. Do not repeatedly flush to locate the first drip or place absorbent material around electrics while continuing use.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.