Writing to multiple RenderTarget2D's from HLSL pixel shader

[font=arial,helvetica,sans-serif]I need to write to two render targets: one for colour and another for depth+normal (for post-processing). I have a problem, though. Both targets seem to be getting the value output by COLOR0, while the second should logically be getting the value from COLOR1. What did I do wrong?[/font]

[font=arial,helvetica,sans-serif]RT Initialization:[/font]
[font=arial,helvetica,sans-serif]renderTarget = new RenderTarget2D(device, gameResolution.Width, gameResolution.Height, false, graphics.PreferredBackBufferFormat, DepthFormat.Depth24);
extraTarget = new RenderTarget2D(device, gameResolution.Width, gameResolution.Height, false, SurfaceFormat.Color, DepthFormat.None);[/font]

[font=arial,helvetica,sans-serif]Using RTs:[/font]
[font=arial,helvetica,sans-serif]Device.SetRenderTargets(new RenderTargetBinding(renderTarget), new RenderTargetBinding(extraTarget));[/font]

[font=arial,helvetica,sans-serif]Relevant HLSL:[/font]
[font=arial,helvetica,sans-serif]struct Pixel
{
float4 Color : COLOR0;
float4 Extra : COLOR1;
};

Pixel PS(Middle input)
{
Pixel output;

// perform other shader code

output.Color = float4(totalDiffuse * matDiffuseColor * color.rgb + totalSpecular * matSpecularColor, color.a);
output.Extra = float4(input.Position.z / input.Position.w, clippedNormal);

return output;
}[/font]