what sort of leak are we talking about here ?
Welcome aboard by the way
As you're new to Ribs you should first be aware that all RIBs "give a little" and by that I mean they don't stay hard like a bicycle or car tyre for months on end. RIB tubes do leak.
Of course you shouldn't expect them to go down over night, however, if a week passes and you need to top them up - not pump them right up, this is perfectly normal.
I'm sure you'll figure it out. Anyway, good luck and feel free to seek further help, it's our pleasure
At some time in the future you'll want to sell her, so do yourself a favor, when yoou find the leak (if one exists) spend that extra few quid and get it professionally repaired. Both you, the boat and it's future owner will benefit from the same.
Check the valves first, they may just need the internal gubbins tightening a little. And....get us a picture up on the forum.