Miles there are many facets to the accountability issues the other guys raise here.
One is the total breakdown of carrier reporting of Service Difficulty Reports.
From two earlier surveys I had done ( "Frivolous SDRs" and "Annex 2008 (SDR under reporting"), Dave Evans in Aviation Safety Digest, has just published a article "Distracting Attention From Systemic Safety Shortcomings".
See Link >
Distracting Attention From Systemic Safety Shortcomings|Aviation Safety Journal Dave can provide you with my e-mail,
Thanks for the good work at PBS