Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Unclip and remove diverter motor from spindle

Observation:

Using a mirror inspect the diverter spindle is in good condition with no sign of corrosion or water present.
Push the diverter spindle and check it moves fully (approx 10mm) and springs back into position.
Note:
It is difficult to move spindle by hand, use an appropriate tool to assist.