Service Manuals for Blue Bird School Buses - Central Central States Bus Sales, Blue Bird's largest school bus distributor, is please to offer electronic versions of service manuals for many Blue Bird school bus models. FREIGHTLINER Bus & Coach Wiring Diagrams, Service Manual Some FREIGHTLINER Bus & Coach Wiring Diagrams, Service Manual PDF are above this page. Today Freightliner Corporation, based in the US city of Portland, Oregon, is a leader in sales of truck equipment in the US. But it was not always so. The success of the company is the result of hard work, long-term marketing research and competent price policy.