eS128 Control Backlighting

Hello,

On my new eS127/eS128 installation the red control backlighting on the eS127 is plenty visible at night, however on the neighboring eS128 it's very dim/faint and hardly visible at all. I have both units setup to sync brightness, and that is functioning properly. How can I increase the red backlighting on the eS128?

Thanks,
Ryan