The command that you can send to the led array in the mainkeyboard are presented so:
you get the following commands to active each led in the board:
LOC,ON\n
LOC,OFF\n
AP1,ON\n
AP1,OFF\n
A_THR,ON\n
A_THR,OFF\n
AP2,ON\n
AP2,OFF\n
EXPED,ON\n
EXPED,OFF\n
APPR,ON\n
APPR,OFF\n
FD_C,ON\n
FD_C,OFF\n
LS_C,ON\n
LS_C,OFF\n
CSTR_C,ON\n
CSTR_C,OFF\n
WPT_C,ON\n
WPT_C,OFF\n
VOR.D_C,ON\n
VOR.D_C,OFF\n
NDB_C,ON\n
NDB_C,OFF\n
ARPT_C,ON\n
ARPT_C,OFF\n
FD_P,ON\n
FD_P,OFF\n
LS_P,ON\n
LS_P,OFF\n
CSTR_P,ON\n
CSTR_P,OFF\n
WPT_P,ON\n
WPT_P,OFF\n
VOR.D_P,ON\n
VOR.D_P,OFF\n
NDB_P,ON\n
NDB_P,OFF\n
ARPT_P,ON\n
ARPT_P,OFF\n
F/O_PG,ON\n
F/O_PG,OFF\n
F/O_PR,ON\n
F/O_PR,OFF\n
MASTER_WARM_P,ON\n
MASTER_WARM_P,OFF\n
MASTER_CAUT_P,ON\n
MASTER_CAUT_P,OFF\n
F/O_CG,ON\n
F/O_CG,OFF\n
F/O_CR,ON\n
F/O_CR,OFF\n
MASTER_WARM_C,ON\n
MASTER_WARM_C,OFF\n
MASTER_CAUT_C,ON\n
MASTER_CAUT_C,OFF\n
FULLY,ON\n
FULLY,OFF\n