sounds like just a blown bulb mate, and yes they can be replaced, is a fiddly job as you have to take the dash apart, bout 20 screws in total, not a hard the way i done mine was take the steering wheel off, take the stereo out, unscrew all the heater controls and unplug them , unplug all the switches like fogs etc, unplug them (make sure you do something to rimind you what is what and work your way right, take bout 30mins to take it all out
