Hmm, this was prematurely marked as solved. I gave it thumbs up last week because this provides > 50% of the answer in the sense that it says "the six sensors from that API call are these six sensors here".
But it doesn't say which sensor is for which thing (controller, canister, etc.) so I didn't accept it as solution.
Anyway, this is fine, but I'll post the remainder of the answer once I find it.
Three pairs of values are obtained on the EF570 (could be similar for other models). The first value is is CPU temp (in C), the second is 128 for Optimal and non-128 for not optimal reading, the third is PSU temp sensor (in C).