I have a Niterider Classic Plus 2006. It has two halogen bulbs, 12 watt spot and 20 watt flood. The 12 watt suddenly stopped working, I assume the bulb is burnt out, but I'm not sure. NR offers replacement bulbs on their web site for about $20. Does anyone know if this is something that I can replace myself or does the entire unit need to be sent to NR? If it can be done at home, what is the procedure. Thanks in advance for any input.