The Master Caution/Warning buttons on Captain and First Officer Side both access these offsets. They are controlled by the Glass Cockpit as a response to Instructor Station Failures and ECAM Warnings.

INPUTS:
0x56F8 .0 MasterCautionSwitch
0x56F8 .2 MasterWarningSwitch

OUTPUTS:
0x56F7 .0 MasterCaution
0x56F7 .2 MasterWarning

Failures Input Variable
0x5750 1 FailureCode

Values written to that byte offset cause these failures:
10 IAS/Pitot Fail
50 APU Fail
51 Engine 1 Fire
52 Engine 2 Fire
55 APU Fire
61 fwd1pumpfault
62 fwd2pumpfault
63 ctr1pumpfault
64 ctr2pumpfault
65 aft1pumpfault
66 aft2pumpfault
91 AC BUS 1 Fault (91)
92 AC BUS 2 Fault