I have a Mackie 32x8 8 bus mixing console in my shop for repair. On 3 channels the lower part (HI and LO EQ) of the 7 EQ pots aren't working at all. And on another channel any manipulation of both the EQ level pots results in a high volume fixed tone. Anyone had the same issue before? And knows how to fix it? Also, the output section is quite noisy at startup and the LED display of the L/R main out doesn't seem to receive a signal although when powering the console up it is working but just for a brief moment.