they are so cheap to buy,just replace it.not worth spending time testing it,or repairing it,by the time you buy a choke,your better of replacing the fitment
bulbs get black at ends when they are faulty,the starters get brown when at life end,if you change the tube,replace the starter too.
mm
January 2011
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix lighting.