Hi, I have a P3eX with and V1 expansion box, both with temp probes connected. Until the latest firmware update to v6.27 the two probes tracked each other within 0.1 - for example when Temp1 read 25.0C Temp2 read 24.9C and this was consistent across the aquariums daily range up to 26.3C. Both probes are in the same location in the sump but since the firmware update Temp2 reads 1.1C above Temp1, nothing else has changed. I'm aware that I can adjust the temperature but wondered what else could have caused this change? Temp1 seems to be correct against a mercury thermometer, Expansion Box firmware is 1.07. Any suggestions? Regards, Andy