WP 6287 Installed additional ADC in h1oaf0 I/O chassis, bus slot 2-8. 8:05 PST powered down h1oaf0 computer, I/O chassis. Installed new ADC and interface card. Powered down TCS AI chassis, powered up I/O chassis. Remotely started h1oaf0 computer, verified card was detected, powered TCS AI chassis back on. Out of CER at 8:25.