You don't need the source code for the embedded control software and diagnostic systems. If you're pirating the whole engine design anyway, just copy the binary from the example you're copying.
(Then just make sure not to hook it up to any radio transmitter under the engine's direct control, so it can't call home to the American manufacturer and be disabled remotely.)
The Chinese have been trying for years to reverse engineer older Russian turbofan engines and still can't get them quite right. And those are a level below the F414 in complexity.