3508 Controller manual automatic switching using user value via Modbus

On my 3508 controller I am trying to write to a user value at address 4962 via Modbus comms. The Modbus comms is working correctly as I have other values sent and received. The address at 4962 however will not allow me to write a value to it. Any ideas why? I am trying to write to this value as the customer wants a value of 1 to set the instrument to automatic.
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