Reference Code Description/Action Perform all actions before exchanging Failing Items Failing Item0124 Install Disk Unit K21Concurrent maintenance informational reference code.0125 Install Disk Unit K22Concurrent maintenance informational reference code.0126 Install Disk Unit K23Concurrent maintenance informational reference code.0127 Install Disk Unit K24Concurrent maintenance informational reference code.0128 Install Disk Unit K25Concurrent maintenance informational reference code.0129 Install Disk Unit K26Concurrent maintenance informational reference code.012A Install Disk Unit K27Concurrent maintenance informational reference code.012B Install Disk Unit K28Concurrent maintenance informational reference code.012C Install Disk Unit K29Concurrent maintenance informational reference code.012D Install Disk Unit K30Concurrent maintenance informational reference code.012E Install Disk Unit K31Concurrent maintenance informational reference code.012F Install Disk Unit K32Concurrent maintenance informational reference code.01AC Detected AC lossIf system powers on normally or stays powered on after AC power failure,no replacement of parts may be needed.ACMODUL0200 Remove Disk Unit 1Concurrent maintenance informational reference code.0201 Remove Disk Unit 2Concurrent maintenance informational reference code.0202 Remove Disk Unit 3Concurrent maintenance informational reference code.0203 Remove Disk Unit 4Concurrent maintenance informational reference code.1xxx72 iSeries: iSeries 270, 800, 810, 820, 825, 830, 840, 870, 890, SB2, and SB3 Analyze Hardware Problems (System Reference Codes)