I am having the same retraction issues with position 3 in my AMS. (P1S)
Has there been a solution yet?
Same problem here. Got it at christmas and all new to me put the fillament in slot 3 and it didn´t work. Thought it was me but the used slot 1 and it worked fine. Slot 3 can be used with little help when i push the gray feeder hole. Ones it gets in the printer head it will print. At the and and the fillament is retracked the spool wil not turn and and up wih a lot off lose fillament wire in the AMS. The gears do not engage