Asco 300 series transfer switch 3 phase

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Aircommuter

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Coulterville, ca
I have customer with above switch, it has been in operation 6 years. Today when the power failed it started the generator and seemed normal. When the utility source came back the generator shutdown immediately. Then a few hours later when the utility failed again the switch did not start the generator. The source accepted light for the emergency (gen) is illuminated green all the time, before it worked normal.
I thought maybe someone had this problem in the past before I start testing with the wiring diagram.
 
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