mercedes GLK350

B Service: Inspection of:Battery, check condition using a battery tester (and auxiliary battery if so equipped), Brake Fluid, Brakes and Traction Control, Inspect the Brake pads, discs, lines and hoses Cooling system, antifreeze and corrosion protection, lines and hoses, Drive Belt, Flex disks, Check fluids, Any leaks at major components, any damage to underside of vehicle or engine compartment Hood is checked for proper operation of hinges, catch and the safety catch Lighting (all high beams, haz warning lights, turn signals, warning and indicator lamps, illumination of interior and exterior lighting, front/rear bulbs, trunk or cargo area lighting) Seat Belt system: buckles and belts and operation, Parking brake: Function test only, Steering: Inspect play of tie rod and joints, inspect rubber boots Suspension: Check the front axle ball joints and rubber boots, Tires are inspected for damage and splits, measure tread depth (including the spare if equipped). Correct tire inflation (pressure) as necessary. Check expiration of tire sealant if equipped. Wipers: Blades, washer system, any headlamp cleaning system and rear window wiper/washer, if applicable. Washer Fluid: Replace or refill as necessary. Inspect/Adjust Headlamp, (correct adjustment if necessary) Engine Oil Oil Filter, Engine Service Reminder Indicators are reset. As far as the "3" portion, many think it means the third time it appeared, but I'm not sure.