Command
:SENSe<Ch>:CORRection:EXTension:AUTO:RESet
This command clears old auto port extension delay and loss data in preparation for acquiring new data.
Ena.WriteString ":SENS:CORR:EXT:AUTO:RES", True
No equivalent key is available on the front panel.
SCPI.SENSE(Ch).CORRECTION.EXTENSION.AUTO.RESET