I have completed a full set of measurements checking for basic coherence of input/output of the Aux Channels for every suspension. Suspect channels were retested a number of days later. Those that failed in the same manner were labled as "bad" or "failed". Those that changed, either significantly or marginally were left to question. Below is a crude spreadsheet that illustrates my findings so far. The measurement technique is noted on the spreadsheet.
Apologies. The original post didn't include channel names.