per Work Permit Number: 4912

A -4300 count offset observed on L4C channel.  Looked like losing one leg of the differential input.
After narrowing down the offset to the I/O chassis by moving input cables and the ADC cables around and checking the AA chassis.  We swapped the ADC board with no change in offset.  We then swapped the ADC interface board and cable this fixed the problem.  I have thrown out the cable and will test the board in the test stand.