In the Display i noticed an indication saying that B5 SERVICE IS REQUIRED. MODEL E230 - YEAR 2003

Hi,
B-Service — First visit at approximately 20,000 miles or one year after previous service, but determined by Flexible Service System; then every 20,000 miles or 2 years. This is actually pretty essential to do, despite seeming like a lot of money for not much work.
Services performed:
Interior · Function check · Check warning and indicator lamps, illumination and interior lighting · Check windshield wiper, windshield washer system, headlamp cleaning system · Reset maintenance service counter in instrument cluster · Replace dust filter (not applicable to SL-Class) · Replace combination filter (SL-Class) · Check parking brake (function test only)
Wheels, brakes · Check condition/thickness of front and rear brake discs · Check front and rear brake pads for lining thickness · Check tires for damage and condition · Measure tread depth, record in mm · Correct tire inflation pressure
Underside of Vehicle · Check for major components leakage · Check for chafe marks, line routing, damaged components · Check condition of front axle ball joints and rubber boots · Check condition of mechanical steering components and rubber boots
Engine Compartment · Check for major components leakage · Check for chafe marks, line routing, damaged components · Check and replenish all fluid levels · Change engine oil and filter · Check engine cooling system, antifreeze and corrosion protection · Check brake system · Check power steering · Check Active Body Control · Check windshield washer system · Check and correct battery fluid level · Check battery condition · Check catch, safety catch and hinges on engine hood for proper operation · Check condition of poly V-belt
Trunk · Check battery condition · Correct tire inflation pressure in spare tire

Thank you!