Yep, secondary actuator diaphragm gets replaced. It can get air in the line and then you have no clutch. Harley better hurry up and come out with a quick-shifter like BMW, Aprilia, KTM or if that line gets air in it, you better start down shifting asap to get to neutral when that Kenworth pulls out in front of you.
What's interesting is that they made a production change for this part for the 2019 models which were announced in August at the dealer show so they must have known about the problem long before the 2019's went on sale. My guess is that a few H-D bikers got smashed into a light pole or flattened by Burlington Northern at a crossing with no clutch and BAM!..........here comes the recall after some out-of-court settlements.