Thanks for the tip. I did check the voltage and found 3.8 VDC. I assumed my meter was off slightly. After talking to the customer further, she told me they had a violent thunderstorm in the area when the unit stopped working the second time. They did not have a surge protector so I sold them one and again replaced the PCB. It is working fine now so we will see if this problem comes back again. The good news I bought these boards from Repair Clinic.
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