I had a great time assembling the Larson scanner with my kids! It works, but two LEDs won't illuminate, 4 & 5. We used the extra LED to test that they were correctly oriented, and they are, they just aren't getting any volts. Most of the LEDs are getting... I think .722 volts when it is their time to shine, but those two middle LEDs are only getting millivolts of power. All of the solder connections look good visually. The chip isn't getting warm. Any ideas? The resistors aren't sensitive to orientation, are they?