5100 ICP-OES Peri-pump not rotating

The  peristaltic pump on my OES isn't rotating when the pump options are activated.

There is nothing obstructing the rollers from rotating. When I removed the roller housing, the internal bar that moves the roller isn't rotating either but I can still hear a hum from the pump motor inside the instrument housing.

There probably isn't a quick fix to this without replacing the pump motor component? 

Would appreciate your suggestions.

Many thanks

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