I think you do need to at least acknowledge the problem. With a clear non-technical explanation of the problem in the first paragraph. The rest should go into real technical details of the result of the investigation, not an investigation itself.
Why is it confusing? I did not find it confusing. I like such excruciatingly detailed postmortem analyses, they make for great reading and my respect for the company that does this is increased by reading these.
I think you do need to at least acknowledge the problem. With a clear non-technical explanation of the problem in the first paragraph. The rest should go into real technical details of the result of the investigation, not an investigation itself.