Finally found the fault! It was the Ribbon Cable! Arrrrgggghhh!!!
Flexing and stressing the 4 connector ribbon cable address line 1 was intermittently shorting to ground.
When check for continuity it appeared fine A real B-gger to find, So people, be aware!
Flexing and stressing the 4 connector ribbon cable address line 1 was intermittently shorting to ground.
When check for continuity it appeared fine A real B-gger to find, So people, be aware!