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http://www.cliosport.net/forum/showthread.php?t=158796&page=2&highlight=tdc+sensor+172
might be of help.
Sensor looks like this
http://ysfc.weblogs.jp/chronofile/images/P4270424.jpg
Easy job to do if you have magic stretchy hands.
Silver coloured indicator bulbs in the front lights, stops the "egg" effect.
without
http://www.cliosport.net/forum/attachment.php?attachmentid=18179&d=1175617645
With
http://www.cliosport.net/forum/attachment.php?attachmentid=18180&d=1175617645