The 12X controller has failed. All connections on this loop will be in a failed state. If there are errors logged against I/O Adapters on this loops, do not replace any I/O Adapter hardware. This SRC is the root cause. Collect the loop configuration of the system. Then work with your service provider to collect error logs. Work with the FRU list in the Serviceable Event View if there is one, otherwise, use the FRU list documented here to determine the parts to exchange.