Minor Description
Sensors aren't linked to ports on IOS-XE devices. I'm guessing this is because of the way the physical entities are being reported by the device. On IOS the SFP is a child of the port container and the sensors children of the SFP. On IOS-XE the port is child of the transceiver along with the sensors. I attached some screen shots of of the inventory of two different devices that show this.
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Mike, you should have had an email from my corporate email address? If you can share your source address by reply I can get SNMP access to the device arranged. 
timcooper I'm not sure with which ports this sensors should be linked?
Think I need snmp access to device for more detailed view (if possible, you can write me to mike@observium.org)
I did, but I have run again and attached the update debug output in case that helps?
timcooper but you rediscovered sensors (after update)? (this is main condition)
Thanks for looking at this so quickly Mike!
Updated to r8964 but no change:
Let me know if any further debug outputs would be of help?
Tim C
Seemed sensible to update this existing issue rather than create a new one? Seem to be seeing this same issue on the new 64-bit flavour of IOS-XR on an ASR99K.
Sensors debug (./discovery.php -d -m sensors -h <device>) attached;
Added debug as requested and also two more screenshots that show the difference in how the sensors are presented on the main device page.
timcooper My devel IPs not secure
77.222.50.30, 2a02:408:7722:5030::5030