An additional ADC was added to the h1susauxb123 I/O chassis. The new card was added to the expansion board at bus 1-2, making it ADC1 in relation to the existing ADC cards. All ribbon cables between the ADC and interface cards were rearranged with the exception of ADC0 so that none of the cables to the AA chassis needed to be swapped and the h1susauxb123 model doesn't need to be modified.
I'm assuming it is covered by ECR E1600064 though it is not clear if that ECR shows the additional ADC channels for the sus-aux system needed to support the PI-ESD install on the ITMs.