Alright, brake light switch has been replaced - dealer charged me $17 for the part, which seemed plenty fair.

The intermittent dummy light has stayed out for 40 miles on the road so far.

However, the brake lights are constantly lit now, whether I'm pressing the brake pedal or not. Not good! Any ideas? See this thread:
http://www.peachparts.com/shopforum/showthread.php?p=1491333#post1491333

Thanks!
Cheers, John