This capacitor is only used on older power supply boards. If your board has this capacitor, it should be repalced. However, it can be left alone if it looks okay.
With the power supply shield removed from the monitor, identify the power supply. Along with the listed capacitors, take note of any others you want to replace (Ex: Inverter coil).
Remove the 4 screws from the power supply. Once this is done, lift up the power supply at a slight angle to clear the chassis mounting holes.