new to caravaning help with damp

Hi I am new two caravans. I have just got a avondale argent 530- 5  we got it at the end of last year and have left it in storage for a few months when we went back to it there was some mold on the wood and seats is that just where its been shut up for to long of should I be looking for a leak. Thanks for the help. And sorry about my spelling I am dyslexic