This is an unexpected error for this machine type. You should first resolve any other serviceable events on this machine and if this problem persists, you should then call your next level of support.
The following is the information from the eServer™ product on which this machine is based. This information might be of use to your support engineer.
An invalid configuration was detected on an HSL/RIO loop during IPL.
The four rightmost characters of word 4 in the reference code represent the Program Return Code (PRC), which describes the problem detected. The four leftmost digits of word 7 represent the loop number in hexadecimal format.