Now for the Yamaha, in principle we have the codes, but Yamaha/s documentation from 10 years ago is a little spotty.  Here are EFCs from partly the RX-V2400 and partly a HTR-5790.  I haven't included all of them!

You need to use setup code Audio 1815 for these EFCs to work.
6 Chan In-Toggle 64197
6.1 ES-Toggle 47813
Auto Tune-DN 23173
Auto Tune-UP 22149
CBL/SAT 58821
CD 45253
CD-R 12741
DC Trigger OFF 48261
DC Trigger ON 50053
DTV / LD 40133
DVD 59845
DVR/VCR2 46021
Display 59333
Dolby/Enhanced 18053
Dolby/Normal 18565
ES Discrete ON 16517
Effect Off 01413
Effect On 04741
Home-Mem "A" 37765
Home-Mem "B" 35973
Home-Mem "C" 36997
Home-Recall "A" 53381
Home-Recall "B" 52869
Home-Recall "C" 53893
Input Mode-AUTO 05765
Input Mode-Analog 38789
Input Mode-DD RF 06789
Input Mode-DTS 38277
Input Mode-Digital 39301
MD/Tape 11717
Menu 13509
Neo:6 Cinema 33157
Neo:6 Music 32645
Phono 44229
Power OFF 17029
Power ON 16005
Power Toggle 36741
Preset Page Toggle 44997
Program Adventure 19333
Program Disco 50565
Program Freiburg 34181
Program Game 51077
Program General 17541
Program Hall A 02437
Program Hall B 01925
Program Live Concert 01669
Program Mono Movie 51845
Program Roxy Theater 34949
Program Sci-Fi 18309
Program Spectacle 18821
Program TV Sports 17797
Program The Bottom Line 33925
Prologic II Movie 66181
Prologic II Music 32133
Select 46789
Select Audio Adjustment 63173
Set Menu + (Parameter Right) 14021
Set Menu - (Parameter Left) 15045
Set Menu Down 58565
Set Menu Down (Parameter Down) 13509
Set Menu Left 60101
Set Menu Right 59077
Set Menu Up 59589
Set Menu Up (Parameter Up) 14533
Sleep 41669
Speaker A-OFF 38021
Speaker A-ON 39813
Speaker B-OFF 38533
Speaker B-ON 39045
Surround / Effect Toggle 40645
Test 63685
Tuner 44741
Tuner Band-AM 22661
Tuner Band-FM 21637
Tuner Preset + 44485
Tuner Preset - 45509
Tuner Preset 1 02245
Tuner Preset 2 01669
Tuner Preset 3 02757
Tuner Preset 4 34245
Tuner Preset 5 35269
Tuner Preset 6 34757
Tuner Preset 7 35781
Tuner Preset 8 33989
Tuner-Bank "A" 01477
Tuner-Bank "B" 02501
Tuner-Bank "C" 01989
Tuner-Bank "D" 03013
Tuner-Bank "E" 01221
V-Aux 41157
VCR1 29381
Vol-Memory "A" 33669
Vol-Memory "B" 31877
Vol-Memory "C" 32901
Vol-Mute Toggle 11461
Vol-Recall "A" 49285
Vol-Recall "B" 48773
Vol-Recall "C" 49797
Volume + 12229
Volume - 13253
Z2 In-CBL/Sat 25797
Z2 In-CD 43461
Z2 In-CDR 42181
Z2 In-DTV/LD 10693
Z2 In-DVD 26821
Z2 In-LD 43205
Z2 In-MD/Tape 27333
Z2 In-Phono 42437
Z2 In-Sat 27589
Z2 In-Tape 43973
Z2 In-Tuner 42949
Z2 In-V Aux 09669
Z2 In-VCR 3 26309
Z2 In-VCR1 42693
Z2 In-VCR2/DVR 43717
Z2 Volume + 10181
Z2 Volume - 11205
down 14789
left / - 41925
right / + 40901
up 13765