Well you tell me C240 (as I suspect you are about to anyway). Are the uncommanded power excursions and run downs still present? No? What made them go away? After 15 years I would imagine that even in a safety critical component such as this (ie if it ain't bust don't fix it) there would be redesign, revision and update. You know stuff like ensuring that the reversionary channel to the primary digital one wasn't itself digital?