The 0.100-inch insulation displacement connectors on the trough boards may have issues; for example, the wires are not held firmly in the V-slots of the connector. Given that the issues appear to be popping up as movement is involved you might want to try wiggling the connector as well as the wires "punched" into the slots in the connector to see if that affects the operation when in test mode. I had to replace one of the trough board connectors on my IJ a few years back due to this issue.
(Topic ID: 87066)
San Diego, CA
