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
01050
Service Bulletin/Repair Instructions
SOME VEHICLES HAVE A BRAKE SYSTEM WARNING LIGHT IN THE INSTRUMENT CLUSTER THAT MAY NOT ILLUMINATE WHEN THE BRAKE FLUID IS LOW, WHEN THIS OCCURS, THE VEHICLE MAY NOT MEET THE PARTIAL SYSTEM REQUIREMENT OF REDUCED BRAKING CAPABILITY. *SLC
3170E
Service Bulletin/Repair Instructions
IPC, INTERIOR LIGHTS AND/OR HEADLAMPS FLICKER. *AK FB2