Jonah Briggs

• Diagnose and repair Cummins, Detroit Diesel, and Paccar powertrains on 40+ commercial trucks; average first-time-fix rate above 92% on assigned work orders. • Lead scheduled PM inspections (A/B/C) for regional delivery fleets; cut roadside breakdowns 18% YoY by catching wear items early. • Overhaul aftertreatment systems (DPF, SCR, EGR); cleared recurring derate faults and restored OEM emissions compliance for 25+ units. • Mentor two junior techs on torque specs, fault-tree diagnosis, and safe jack/stand procedures; documented bay SOPs used shop-wide.

• Maintained diesel transit buses (Gillig / New Flyer platforms); completed brake, suspension, and HVAC jobs to keep peak-hour routes staffed. • Used OEM diagnostic software (Cummins INSITE, Detroit Diagnostic Link) to isolate intermittent electrical and sensor faults under 2-hour SLA. • Rebuilt air-brake systems and wheel ends; zero safety write-ups across three annual FTA maintenance audits. • Supported overnight shift turnarounds—averaged 6–8 complete service tickets per shift during summer heat peaks.

• Assisted senior mechanics on excavators, loaders, and yard trucks: oil services, filter changes, belt/hose replacements, and grease routes. • Learned hydraulic troubleshooting and cylinder reseal basics; independently completed PM services on 10+ machines by end of apprenticeship. • Kept parts room organized and tagged cores for warranty return; reduced missing-part delays on rush jobs. • Earned forklift certification and practiced lockout/tagout on shop equipment under supervision.

Coursework: diesel engines, electrical systems, brakes, hydraulics, preventive maintenance

ASE Medium-Heavy Truck Certification (T2 Diesel Engines; T4 Brakes; T6 Electrical/Electronic Systems) CDL Class A (Texas) — clean driving record EPA Section 609 Motor Vehicle A/C OSHA 10-Hour General Industry Forklift Operator Certification