IBM 9080-M9S Manual page 20

Figure 12. Identify LEDs for the service processor cables on the system control unit
5. If you chose to complete this repair with the power off, label and disconnect both UPIC cables from
the system control unit.
UPIC cable locations are P1-C1-T1 and P1-C2-T1.
a. Remove the white plastic lock (A) from the plug housing.
14 Power Systems: Removing and replacing parts in the 9080-M9S system