Murphy:
The dual sidestick input(s) are bracketed time-wise with Prim 1 fail or switch off, and Sec 1 fail or switch off. Where are the switches situated to switch off/isolate/disable these units? I recall somewhere that dual SS use has to be enabled to allow summing of stick movement. Could the movement be the result of a hand finding it's way back to the SS?
Gums, if you are around: when this thread is all wrapped up and shifted to the dusty vaults, don't wander back to your Sipping Whiskey and fishing pole- we need a memoir writing!