As far as I can recall, the CA doesn't have a separate/removable crown tube as it's an integrated part of the midcase, so unless they replaced the whole midcase for some reason (which is highly unlikely without you knowing), it definitely sounds like an issue with the crown itself. The crown may well have been changed as part of the service (that's not unusual at all), so it sounds like there's an issue with it. I'd recommend sending it back to be checked as obviously the crown is designed to screw-in totally flush and if it's now not doing that I wouldn't fancy the potential risk to its water resistance.
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