Your question is Debugging CAN Bus LRU Hang. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You have a test script running on a PC connected to your LRU via CAN bus. The unit is unresponsive. Describe how you would debug the issue to identify the root cause.