Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Unclip and remove diverter motor
(this does not need appliance to be drained down)

Observation:

Inspect diverter body / spindle and the motor for any signs of water ingress or damage.
Note:
If no water is present do not refit motor as the position it is in will affect the following test.