Steam leaking from Bosch dishwasher?

Hi - hope someone can help me. My bosch diswasher seems to be leaking steam which has damaged the cupboard door next to it. It has also caused some warping to the appliance housing and looks like it is starting to affect the integrated door too.
Its been fitted about 2 years now and the damage has occurred since Xmas 2008. We have bought a replacement door for the cupboard but need to fix the underlying problem to stop it happening again.
There is no water leaking - so don't know whether it is the seal, or whether the door catch it not working properly.
Any advice would be very gratefully received!!