Everything here is from the references shown below, with a few comments in an alternate color.
Indicated channel(s) of the Flight Control Computer have failed.
Photo: Possible Cause, AFM, §03-13-70
Click photo for a larger image
To view the FCS Synoptic Legend, refer to 03-13-190, FCS Synoptic Legend.
IF FCC 1B AND 2A CHANNELS ARE FAILED, SELECTING THE UPS BATTERY SWITCH OFF WILL RESULT IN LOSS OF AIRPLANE CONTROL.
Gulfstream GVII-G500 Airplane Flight Manual, Revision 4, August 29, 2019
Gulfstream GVII-G500 Production Aircraft Systems, Revision 3, July 15, 2019
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