The customer will be visiting for an overview of AFS autonomous airplane in three days. We are planning to show off an auxiliary feature for remote control of an APU engine start. The APU has redundant speed inputs. The APU controller has some unknown selection criteria for which input it selects. The controller costs $13, 000 The software team just pulled an all-nighter to get the software load that runs the controller. In your first engine crank, the engine turns over an stops after 5 seconds. The built-in-test now shows a fault. You have a spare APU controller. Outline what troubleshooting approach you would take in the first 2 hours. Despite your quick troubleshooting, you can not find a failure. What is your next step? Please write a 6 line email to the Program Manager justifying your decision