The MRI Enterography is a much better diagnostic test than the CT Enterography. It's more expensive to do, which is why they always do the CT first to see if they can find something. FYI I posted a long thread about my MRI Enterography which I linked below:
There is also the possibility of the capsule endoscopy, if the MRI is inconclusive as to location. With your obstruction history, the capsule endoscopy could be very risky, although I have read that the capsules used have gotten smaller and smaller over the years, so maybe not. Do the MRI Enterography, see what happens and what is learned, and then if there is still no clarity, ask about the capsule endoscopy.