Leave maintenance and fault investigation alone until the supply arrangement is identified safely. Do not trace wires by pulling the appliance, opening electrical boxes or unplugging unidentified wet connections.
What the observation tells you
A cabinet may contain supplies for the dishwasher, hot-water tank and disposer together. Switching off the wrong appliance can leave the disposer live while giving a false impression of safety. Photographs of accessible labelled controls can help a qualified person advise.
A useful next step
Keep everyone from using the disposer and explain the access problem when booking. If water is reaching electrics, avoid the wet area and obtain urgent appropriate assistance.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.