Use this information to diagnose and fix any problems that
might occur in your PCIe Expansion Node.
Event messages
Hardware events in the PCIe Expansion Node are detected by the integrated management module (IMM) in the compute node that the expansion node is connected to.
Light path diagnostics
Light path diagnostics is a system of LEDs on the front panel and on various internal components of the compute node. When an error occurs, LEDs can be lit throughout the compute node and the PCIe Expansion Node to help identify the source of the error.