I think I have to agree with your partner, once the signal for serve has been made everything is "locked" until the ball is contacted. Sure players can move if they catch themselves or what ever, but I don't think we can have a lineup check after the signal for serve. Let's play devils advocate, would you allow a substitution after the signal for serve? Or a libero replacement? Or a time out? Seems to me a lineup check is in line with all of these that are also not allowed once the signal for serve has been given.
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