No audio out of center channel on STR-SE501. All cold solder joints have been repaired.

My STR-SE501 had the cold solder joint problems that everyone has described on this form and I have repaired them all. Every thing now works except for the center channel. If I put my ear real close to the speaker I can hear some white noise, but no audio. If I turn the center channel on/off the relay seems OK. I've connected the center speaker to a different channel and the speaker and wiring are OK. Are there any other common problems that would cause a loss of center channel audio? I don't have the equipment to check the signal paths.

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