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.
SB-10-08-50-003B
Service Bulletin/Repair Instructions
GENERAL MOTORS: INFORMATION PROVIDED BY BULLETIN FOR ALL 2012 AND PRIOR GENERAL MOTOR TRUCKS AND PASSENGER VEHICLES REGARDING THE ADJUSTABLE COMFORT AND CUSTOM UPHOLSTERY OF THE DRIVER AND THE PASSENGER HEAD RESTRAINT. *PE
031103
Service Bulletin/Repair Instructions
TECH 2 UPDATE AVAILABLE FOR THE PASSENGER DOOR MODULE. *TT *JB
030601008
Service Bulletin/Repair Instructions
CRANKSHAFT REAR OIL SEAL LEAKS DURING EXTREME COLD WEATHER OPERATION. ON CERTAIN MODELS INCLUDING THE CHEVROLET AND GMC C4500/C5500 MODELS. *TT
022103
Service Bulletin/Repair Instructions
UNNEEDED REPLACEMENT OF POWER-FOLDING MIRRORS. *TT
021903
Service Bulletin/Repair Instructions
PASSENGER DOOR MODULE REPLACEMENT. 2003 CHEVROLET, GMC AND CADILLAC FULL-SIZE CK PICK-UP AND UTILITY TRUCKS. *TT
020802
Service Bulletin/Repair Instructions
CUSTOMERS MAY COMMENT ON A DISPLAYED WARNING MESSAGE INDICATING REDUCED BRAKE POWER ON 2003 FULL-SIZE PICKUPS AND UTILITY VEHICLES. *TT
3170E
Service Bulletin/Repair Instructions
IPC, INTERIOR LIGHTS AND/OR HEADLAMPS FLICKER. *AK FB2