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
PIP-4695
Service Bulletin/Repair Instructions
GM: LOSS OF POWER HESITATES ON ACCELERATION. 4.3, 4.8, 5.3, 5.7 AND 6.0 ENGINES COUPLED WITH THE 4L60E OR 4L65E MAY EXPERIENCE A CONDITION OF HESITATES, MISSES OR LOSS OF POWER UNDER ACCELERATION. THE VEHICLE MAY OPERATE AS IF IT IS IN REDUCED POWER MODE. *PE
020090002
Service Bulletin/Repair Instructions
SUBJECT REGARDING LUBRICATION OF PROPELLER SHAFT DOUBLE CARDAN CV TYPE U-JOINT CENTERING BALL AND SEAT.*NLM
180601
Service Bulletin/Repair Instructions
SOME CUSTOMERS MAY COMMENT ABOUT A LOSS OF POWER OR EARLY AIR CLEANER REPLACEMENT AND / OR WATER IN THE AIR CLEANER. *TT
040601
Service Bulletin/Repair Instructions
VEHICLES MAY EXPERIENCE UNWANTED AIR ENTRY THROUGH THE VENTILATION SYSTEM. *SLC
191200
Service Bulletin/Repair Instructions
SUBJECT REGARDING THE PROGRAMMABLE OPERATION OF THE SECONDARY INFORMATION CENTER LOCATED IN THE CENTER CONSOLE. *TT