Ouch!
I would if still possible revert everything back to the Microserver gen 8 (if anything has changed since before you started) and then address the Heat issue separately.
Once everything is back as it was and working (including the 2 x 2TB WD Gold drives in RAID 1 back in the Microserver gen 8)
Then address sensor/issue with the server Bay 1, try swapping over SSD from bay 2 to bay 1 and visa versa and see if problem follows the drive (I think this is what @Grisu detailed)
I would be a tad cautious until drive bay issues has been resolved, as the HP Microserver gen 10 plus or RAID card (not sure which controller the RAID 1 setup is using) may have to be returned due to fault ?
One problem at a time 
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Regarding moving RAID 1 drives from 1 RAID Controller to another, I do not see any issues as cards are both HP and RAID configuration is RAID 1, so just remove 2 x 2TB WD Gold drives in from Microserver gen 8 to the hp microserver gen 10 plus and create new RAID Set (drive roaming (drive migration)).
Note: you have probable read this already, but moving drives can be done by drive roaming (drive migration) but HP kit the issue could be with UEFI boot entries, as they don’t follow the disks When moved, you can use F9 to check on the health of the array under System Configuration. You will then need to select disk logical drive to boot from under the One Time Boot Menu or under System Configuration – Boot Options – UEFI Boot Settings – Add Boot Option – Then pick the correct device and drill down to the correct .efi file to boot from and name the entry
Have a look here : https://community.hpe.com/t5/ProLiant-Servers-ML-DL-SL/Move-RAID-Disks-from-one-server-to-another/td-p/7033936#.Ydm5bmDP1PY
In a completely sane world, madness is the only freedom (J.G.Ballard).
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