EFC's Used on Various Versions of this Device
The efc's listed below can be used as a starting point for an upgrade. Often more than one EFC will be listed for a function. You'll need to test these to see which one works with your device.
Device: Audio / 0091        Brands
Protocol: Aiwa;
Devices: 82;  , ;   ;   ;    
Pid: 005E ; 
Fixed: 4A 00; 
Function EFC
Volume + 205
Volume - 209
Mute 207
Power 018
 

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List

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Function EFC
Volume +
Volume -
Mute
Power
205
209
207
018