Keep the appliance out of use and have the damage assessed. Lack of an immediate leak does not show that a cracked part is cosmetic or that the mounting and electrical enclosure remain sound.
What the observation tells you
Do not squeeze, glue or drill the casing to determine what lies behind the crack. Record how it was noticed and whether the unit was knocked or loaded by stored items. Avoid positioning yourself beneath a potentially insecure appliance.
A useful next step
Send photographs of the damage and the wider installation to the engineer. The assessment should identify the damaged component before deciding whether a supported repair is possible.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.