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
310101
Service Bulletin/Repair Instructions
INFORMATION ON CHECKING GROUND 110 AT THE RADIATOR CORE SUPPORT BEFORE REPLACING THE BCM FOR INTERMITTENT COMMUNICATION PROBLEMS. COMMON CODES ARE EU1031, U1041, C0243, C0244 THROUGH 248, C0253, C0255, C0268 AND C0286. *TT
00063
Service Bulletin/Repair Instructions
GENERAL MOTORS HAS DECIDED THAT A DEFECT WHICH RELATES TO MOTOR VEHICLE SAFETY EXISTS IN CERTAIN VEHICLES. SOME OF THESE VEHICLES WERE BUILT WITH INCORRECT PAYLOAD INFORMATION ON THE VEHICLE CERTIFICATION LABEL. *TT
3170E
Service Bulletin/Repair Instructions
IPC, INTERIOR LIGHTS AND/OR HEADLAMPS FLICKER. *AK FB2