In the run-up to the trip, many divers have their regulator set serviced before it goes into the suitcase. It may sound like a sensible thing to do, but as a rule, these sets cause problems. It is not uncommon that the new parts in the set have to settle down for a while, that takes a dive or 10 and then it turns out whether the intermediate pressure in your hoses is a bit too high. The result is that the set will leak and they cannot always just solve that on board the liveaboard. It is wise to give your set a turn, but make sure you have used it before you start that beautiful journey.