Genuine Dyson DC50 PCB Electronic Circuit board

When would this part need replacing?
When it is blown (might trip house electrics). if the PCB has blown it is also best to check the brushbar motor is ok and is not the cause of the blown PCB.
If the brushbar is not spinning, could also be a brushbar motor fault.

Fits The following DC50 models:
DC50 Multifloor, DC50 Multifloor Complete, DC50 Animal, DC50 Animal Complete, DC50 Animal Limited edition

Genuine Dyson DC50 PCB Circuit board