Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
TSB-42-10-109
Service Bulletin/Repair Instructions
MERCEDES: CORROSION PROTECTION COATINGS FOR BRAKE COMPONENTS AND HARDWARE MAY BE DAMAGED AND OR STRIPPED AWAY IF HIGHLY CONCENTRATED ACID BASED CLEANERS ARE USED. ONCE THE CORROSION PROTECTION IS DAMAGED OR REMOVED THE BRAKE COMPONENTS AND OR HARDWARE CAN BEGIN TO CORRODE. INCLUDE ALL MODELS AND MODEL YEARS. *PE
SB-090930
Service Bulletin/Repair Instructions
MERCEDES: THE LIMITED WARRANTY ON THE SBC HYDRAULIC UNIT FOR MODELS 211, MODEL 219 AND MODELS 230 WAS EXTENDED FROM THE ORIGINAL 4 YEARS/50,000 MILES TO 10 YEARS WITH NO MILEAGE LIMITATION. THE SBC HYDRAULIC UNIT EXTENDED LIMITED WARRANTY APPLIES TO ALL CONDITIONS THAT JUSTIFY THE REPLACEMENT OF THE SBC HYDRAULIC UNIT UNDER THE STANDARD WARRANTY TERMS AND CONDITIONS. *PE
PSIMBNA4020M
Service Bulletin/Repair Instructions
UPDATED INFORMATION TO REFLECT ADDITON OF APPROVED TIRES. *YC
SSIMBNA1412A
Service Bulletin/Repair Instructions
EMISSION TESTING ON DYNAMOMETER. *YC