IBM 6151 Maintenance And Service Manual page 125

CCx
Software Problem
This SRA number indicates that a software problem exists.
The Advanced Diagnostic Routines can be used to ensure that
no hardware problem exists.
CDx
External Power Failure
This SRA number is generated from an error log entry. There
may be a problem with the external power source.
CEx
DMA Channel Error
This SRA number is generated from an error log entry. A
DMA channel error occurred. The failing DMA channel
should be listed in the error log entry used to generate this
SRA number.
Using the error log, find the DMA channel number; then
isolate the problem to a FRU that uses that DMA channel.
Run the System Checkout to check any repairs.
(6/88) Problem Isolation Charts 3-0020-47