Xone DB:4 EQ knob: blue pointer illumination.

Hello,
I am proud owner of a Xone DB4. When I switch the EQ section to isolator mode, the EQ knob pointers light up blue. However, the blue color is very dim. This appears to be a known issue as the Xone:DB4 ages. How can I fix this so that the knobs light up bright blue again?