IBM 6150 Hardware Maintenance Manual page 44

TNL SN20-9843 (03-27-87) to 75X0152 or 75X0166
Service Repair Action Number
The remaining digits of the SRN are divided into three-digit SRA numbers.
The left two digits of the SRA number is the FRU /PIC code. The right
digit of the SRA number is the location number. Use the following SRN for
an example.
FRU/PIC Code Location
1 - Adapter slot 1
See the"Service Repair Action 2 - Adapter slot 2
Number Chart" in Section 3 3 - Adapter slot 3
or Appendix B for more 4 - Adapter slot 4
information. S - Adapter slot 5
6 - Adapter slot 6
7 - Adapter slot 7
8 - Adapter slot 8
9 - Reserved
o -
System board
A through R - Identifies system board
slots, drive positions, switch banks,
or memory module positions.
(3/87) Diagnostics 2-21