During hot, humid weather conditions, some 1988 Buick Regals may experience a condition where the plastic wing nuts that hold the rear speaker boxes to the rear shelf loosen or fall off.
If this occurs, replace the existing nuts (2) with steel wing nuts, Part Number 25512090 or standard metric nuts, Part Number 11507095, that have an M6xl thread.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.