Try to create a simple paper log form.
You will need places for the following data:
Person performing the work
Type of work done
Machine worked on (this field should list the Machine name, Serial number, IP address, Its function on the Network i.e. Client, Server, router, firewall, etc.
Type of network connection: Cat5e, fibre channel,
Network medium: Wired, Wireless, etc.
Reason for worked performed: Rountine maintenance, Hardware upgrade, etc.
Create a space for addtional Notes regarding the work to be performed.
I hope this will do.