IBM 9080-M9S Manual page 342

Figure 288. Removing the UPIC cable lock
b. Push down on the blue cable latch (B) and pull out the UPIC cable from the system control unit.
Figure 289. Removing the UPIC cable from the system control unit
5. Attach the electrostatic discharge (ESD) wrist strap.
336 Power Systems: Removing and replacing parts in the 9080-M9S system