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Dave Perry / The Explorer, Lisa Brashier, a bus driver in the Marana Unified School District, washes down a bus before an afternoon field trip. MUSD's bus fleet of more than 130 buses has 91 between the ages of 12 and 16 years.
Dave Perry / The Explorer, Randy Miller, a mechanic in the Marana Unified School District, changes the oil on a school bus. Every day, four buses within the fleet get a complete examination, repairs and maintenance work.