I started testing some of my UNO's and found one which would not power on using the power jack BUT would power on using the USB-B connection from a PI 3B+...
Other UNO's powered on using the same power supply so I know that isn't the issue...
Put a meter on the voltage regulator, when using just the jack and was getting ~7.47 VDC input and ~0.47VDC output. When I check the 5V/Gnd pins, nothing. Everything else works when powered through UART...
So is there anything else I can check and/or just try to repair the regulator.
Got a new voltage regulator and repaired/replaced and everything is good
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