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
020090002
Service Bulletin/Repair Instructions
SUBJECT REGARDING LUBRICATION OF PROPELLER SHAFT DOUBLE CARDAN CV TYPE U-JOINT CENTERING BALL AND SEAT.*NLM
3170E
Service Bulletin/Repair Instructions
IPC, INTERIOR LIGHTS AND/OR HEADLAMPS FLICKER. *AK FB2