MC-10240159-0001 PDF

A service bulletin that addresses an issue with the sound system in Model series 254 vehicles. The document details a problem with perceptible volume jumps at certain speeds due to a bug in the software controlling the sound system's speed-dependent volume control. The bulletin identifies the cause as software in the control unit and states that a software update will be the remedy. Hardware replacement is not a solution, and no immediate remedy is available until the software update is released.