Hi, Ray. Thanks very much for your guidance. With your course in meter reading, we were able to determine that the voltage looks good. With the USB as a power source, VIN-GND is close to 5V and VCC-GND is close to 3.3V.
However, it appears that the resistance is way too low. For both VIN-GND and VCC-GND, the resistance is under 1K ohms. I’ve studied the back of the board closely with an eye loop and I can’t find a solder bridge. The only thing I can see is some filaments from solder wick (I believe). I’ve attached a couple of pictures – one each of the front and back of the board. Perhaps you can zoom in and see something I can’t.
Thanks again for your help! We’re building this as a family project so it’s a good learning experience.