I suppose modern bikes won't be afflicted with this problem but, the analogue clocks on my Blackbird were illuminated by a very feeble light source. Made me think at least one of the bulbs must be duff. So last weekend I rolled the sleeves up and removed about 18 pieces of fairing before eventually laying my instruments across the table. The internals were found to be clean and dissapointingly all the bulbs were ok too? Purchased 4 blue led's to replace em and then decided to get another 4 red led's just to see which would look best. The red one's proved to be a bit too dim, but the blue one's really do work a treat and now all I want to do is sit in my garage every night with the big light out. def a job worth doing