BOAC,
Re your question “Will it retract the LEDs from full to extend if you stop the alt retract at more than 'UP' (and, of course, will it complete the retraction at 'Clean')?” I think the penny has dropped with me now. Are you asking if you can use the Autoslat system to retract the LEDs after alternate flap extension/retraction? If so, I don’t know the answer, but I believe theoretically yes. However you would have to be mad or v desperate to deliberately bring the aircraft back to the stick shaker just to retract the LEDs, esp when you already have a flap problem.
If I find the answer I may post it here but it is definitely in the “dangerous information” category.
S&L