Sacrificial lamb comes to mind. You are on a short term contract so presenting the findings to a very hostile department won't harm the permanent staff. Saw this happen a fair bit with some call centres.
If you have the chance start cramming whatever the latest incarnation of Six Sigma is. It should be harder for an engineering department to argue with you when it sounds like you are well versed in those quality and efficiency systems. 
Six Sigma is not what it was. Suffered from the idiot purists that demanded everything had to be six sigma levels
* and companies that invented perversions that watered it hopelessly down
Shame really
* they used to hate it when I asked stuff like this: which is the most successful company in the world in terms of revenue and profit per employee: Roger Federer. And is his first serve % six sigma levels of error? No. So don’t make me make initial software coding errors per line the same either.
