Agreed.
As shown, there are different examples of a hard start / no start condition. You need to be specific as to the symptoms, but since it's for a friend, i know that's tough. If the starter itself never seems to be experiencing any problems, then I agree with it being the TFI. But, if the starter dogs out when it gets hot, it could be a worn starter, bad cables, a weak battery, or any combination of the three.
Take care,
-Chris
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