Organizing the service board

At my new job I'm responsible for all the truck services and two week inspections. And to keep everything organized we have a board where we mark the service information with the dates and up coming fixs that will be needed on a truck, and of course millage. Here is a picture showing the service board. 

All the truck numbers are on the far left along with the driver names. Then with a different color for each month we have the service day and the millage that we did the service on. This company likes to do a service every 10 thousand miles and an inspection every two weeks. The date is marked the latest time the truck was in the shop for example if I did an inspection today i'd mark today's date on the board. And then on a separate piece of paper write down all the repairs and all the work you did to the unit.