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The light in the switch can not be changed, the whole switch would need to be replaced.
read the owners manual, it shows an illustrated version of hoe to do this
See your user manual, its great for help with all the basic maintenance
See "Headlight" on page 52 of chapter 11 "Maintenance and Service" in your "OWNER'S MANUAL".....
Access from under the front corner of the car. Remove or push small plastic cover out of the way. Unplug bulb and rotate to remove.
Remove the 2 screws that hold the plastic lens, pull out burned bulb, push in new one (#168 or #194), verify if working, reinstall lens.....
From under the hood, twist off the cover behind the headlight, then turn the collar that holds the bulb in place. Remove the bulb and replace it, reversing the above directions. DON'T TOUCH THE GLASS ON THE NEW BULB, DIRT OR GREASE WILL CAUSE IT TO BURN OUT QUICKLY.
See page 10-52 & 10-53 of your "Owner's Manual", under Section - 10: Maintenance and Service - Replacing Bulbs.....
Your owner's manual has instructions for changing the bulb including illustrations: http://techinfo.subaru.com/proxy/69554/pdf/ownerManual/069554_2003_Legacy/MSA5M0301A_19.pdf
See "Replacing Bulbs" on page 50 of Chapter 11 "Maintenance and Service" in your "OWNER'S MANUAL"..... See the Sources and Related Links section below for light bulb information.
Replace the bulb
See *Rear Combination Lights* on page 10-53 of your "Owner's Manual", under Section 10: Maintenance and Service - Replacing Bulbs.....