I called the customer to get them on the schedule for the semi-annual fire suppression system maintenance. On arrival I did a quick walk through to make sure no visible damage was there. I then put the two systems into test mode. I let the customer know they were low on G510 and that I had a case on my truck. They wanted to get that. I did the testing and changed out the parts. Then I wrote a report and let the customer know if they needed anything else to let me know. I left my card with the maintenance director.