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
010139002
Service Bulletin/Repair Instructions
SOME CUSTOMERS MAY COMMENT ON EXCESSIVE NOISE FROM THE ENGINE COMPARTMENT WITH THE A/C ON. SOME CUSTOMERS ALSO MAY COMMENT THAT THE A/C SYSTEM IS INOPERATIVE. *TT
000864018A
Service Bulletin/Repair Instructions
SOME CUSTOMERS MAY COMMENT THAT THE REAR DOOR WINDOW IS INOPERATIVE. *JB
00051
Service Bulletin/Repair Instructions
SOME VEHICLES EQUIPPED WITH VACCUM POWER, FOUR-WHEEL-DISC BRAKES MAY HAVE BEEN BUILT WITH A KINKED BRAKE BOOSTER VACUUM SUPPLY HOSE. *TT