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