Jedi Padawan,

 I think you just have to start deleting things from the scene and try to render again, see if it works etc.. So, you just have to try and isolate what the problem is. Is there a specific spot on the render where it crashes?  If so what is going on in that area may give you an idea as to the problem.

So I would render the scene as quickly as possible(low settings) and try and find the culprit by deleting things. Hope it goes well for you.

Mike