Check for pending reboot - PDQ Inventory
George Eberle
We are seeing alot of false positives using this method:

Are there any working alternatives to finding pending reboot on list of machines?
0
Comments
If you click on the blue Yes in the Needs Reboot field of the Computer window or the column in the main window, it will open a text file that contains detailed information about why Inventory thinks that target requires a reboot. If you believe the information in that file is incorrect, contact support@pdq.com
https://help.pdq.com/hc/en-us/articles/220536687-PDQ-Inventory-Shows-Reboot-Required