The door of my Oven has come out. It is a 2002 AEG oven part of Oven-Microwave unit. Can somebody suggest who would be able to fix this. I can't find company vendor.

Some have a latch at both hinges to allow removal, or can be opened slightly, then pull out,
Installation should be reverse.
Its likely not broke, they are meant to be removable.

I agree but we have tried to get the latch on but it does not catch the internal arrangement. Is there a tradesman who can look at it or should we try to open up the internal casing. Please guide.

In response to your RED, You need to call an appliance man, someone who understands directions. If I am wrong, what is the answer Genius.
I think you broke it and need a new Oven.