All standard FACP's have a user manual with Wiring Diagram. Check the manufacturer website.
I cant find the telco lines connecting the FACP
You may want to start at the Telco or Internet room. This is the location where all the building phone lines (Bed of Nails)
Should I notify the Central Station and/or Monitoring Company?
Yes. You should have the customer account number, the Central Station phone number and the Central Station Receiver Number (Primary and Supplementary) toll free numbers. Be prepared with the correct credentials and request a service testing status on this FACP while your working on the equipment.