B1 service usually means you have service due which includes the oil and filter change. It comes due to the condition of your engine due to certain mileage. It usually comes every 15000 mileage but Depends On Your Car. They will also look at your engine, break system and everything else to figure out if anything is wrong.
Disclaimer, I am not a mechanic. However, it looks like you need an oil and filter change, inspection and tire rotation.
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