Kenworth Y53-1024 Operator's Manual page 19

Electric Power System
Interior lighting
Your vehicle may be equipped with Light Emitting Diode (LED) interior
lamps. These lamps are more efficient and have a greater life expectancy
than incandescent lamps.
LED light fixtures do not have replaceable bulbs as do incandescent light
fixtures. If an LED light fails the entire fixture may need to be replaced.
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