DeLonghi DE500 Dehumidifier "fan makes knocking noise" Questions

...makes a knocking noise sometimes. It looks like the fan inside is loose. Can you advise what to do or where to get it fixed. To locate a a Delonghi Service Center near you, go to the following link ...

makes a large grinding sound whenever it runs. Does it need to be cleaned? What do I clean? I would guess that some rubber anti-vibration mounts have aged. If so this may allow the cooling fan to move