Mackie mixer LED issue

[Axtman]

I have a Mackie ProFX8 mixer. It works great except the left channel of the mains LED display. The LEDs will not light up to show me the level even though the left channel works. The right channel LEDs light up just fine.

Any idea where to start looking?

[Axtman]

Here is the schematic.

mackie_profx8_main_schematics.pdf

[Axtman]

Here is a stock photo with LEDs indicated.

[g1]

pg.8 shows the bargraphs in the upper right corner. Make sure U81 and U82 are both getting their 5V at pins 16. Make sure the bargraph unit is getting 5V at pins 1,6,11,16.