JCM, schematics for any Apple device are a very rare commodity. It sounds to me like all of your errors are leading to the dock connector. I would start with that one and work from there.
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== Update ==
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JCM, good luck with your repair. I hope it will work out for you. The same diagram is available at pinout.ru and has some more information as well ;-)
JCM, schematics for any Apple device are a very rare commodity. It sounds to me like all of your errors are leading to the dock connector. I would start with that one and work from there.