Alesis Andromeda A6

What I found on the Service Manual about my problem:
Chapter: Knobs Jitter or Don't Reach Maximum Value or Don't Work

° Make sure the ribbon cable going from the Main board to the Front 
Panel Left board is
securely seated.  DONE(Replaced)
° Make sure the large 60-pin ribbon cable going across the Front 
Panel boards is properly.  DONE(Replaced)
seated.
° Make sure the caps and resistors at the Main Mux (upper left corner 
of page 2 of the
Main PCB schematic) are the correct value and are properly soldered.
° Knob jitter can be caused by voltages exceeding 5V at the ADC mux 
input on the Main
board. Check the inputs to U21 on the Main board. If any voltages 
exceed 5V, find the
source (probably the tuning or temperature bus from the ASICs). One 
of the ASICs
might be bad. DONE voltages OK, no-one >5V.[ECN was written to remove 
R62 on Main PCB – make sure it was done. I GOT IT!!!
° Swap Front Panels to see if the problem is with the Front Panel or 
Main Board.
° Make sure the unit has the latest software (V1.40.09 or later has 
new anti-jitter knob
code).  DONE
° Make sure the knob caps aren't pushed in so much that they're 
touching the front panel.  DONE
Pull the plastic cap slightly so that it is not sitting against the 
metal.  DONE
° Try looking at the muxed analog pot signal at the input of the pot 
ADC (page 2 of the
Main PCB schematic), U27 pin 1. The waveform should look like 
a "skyline", with each
"building" representing a pot level. If you turn all of the knobs 
down (to the left), the
waveform should be mostly flat, except for things like the pedal 
inputs, which are
normally high. If you see no signal here, it means the pot signal is 
not getting to the ADC and therefore the micro.

Any suggestion to proceed?
That E62 may be the cause?

Thaks especially to Bob.
Stef