Can anyone shed some light (in the form of ELSA Win, possibly) on the following codes and their causes

00561 - Mixture Adaptation
13-00 - Adaptation Limit (Mul) Not Reached
00561 - Mixture Adaptation
14-10 - Adaptation Limit (Add) Exceeded - Intermittent

Im pretty certain they are an air leak somewhere...I am sure i have been hearing a leak over the last week, but the only time i am getting the chance to fix this is on Friday Morning....the same day as my MOT!

Any help appreciated. I don't have the tools, space, or time to do anything about it until Friday so i really need to have a very good idea what the prob is before then!