Get an oscilloscope and record the waveform/output. Take that to them and see what they say. Then tell them to prove otherwise. It may be sticking (or worn) excitation brushes, or a floating rotor, or the avr is just nbg, or a poor contact in the voltage sensing side. May be other obscure causes like a dodgy drive belt.
14.7 volts is too much. It should be 14.4V. Your meter may need calibrating to prove that (but it might easily be 14.9V which is far too much voltage for any 12 volt lead acid battery at full charge). Digital meters often read too high when it's internal battery is getting low.
Check your battery electrolyte level if the charging voltage exceeds 14.4V as it will be electrolysing the water.
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