S1: We knew that Qsoil here has been mostly down (a few good samples have come through). No obvious issues with cables/connectors/etc., but still bad Qsoil values (nan). Pulled entire probe out of the ground and brought back to trailer. (In the process, disturbed Gsoil, which did change briefly by as much as 0.5 W/m2, but seems to have settled back in.) In trailer, find that the Qsoil PIC continuously resets when a probe is connected, and never is able to give it the full 3.3V excitation pulse. Either the EC-5 is dead, or something is wrong with the PIC front-end to the probe. (The rest of the PIC runs fine.) Further debugging needed, but in the meantime, no Qsoil at this site. (Since we don't have a spare EC-5, the only other option is to take the Qsoil PIC to another site (9 or 15) and swap it in as a test. I'm sorry I didn't think of this when we were at S9 this morning...)
Thought about taking core, but rather useless if no Qsoil!
...