Cheers. It was an odd one to figure out. At first I believed it was just the ports, then I believed it was just the switches. I couldn’t find anything wrong with the stems. Lubing didn’t change anything.
Furthermore, one naturally assumes it’s something wrong with the North end, with the stem feet and the contact. 99% of the time, there’s no need to even look at the South end.
The first? You sure about that?