Mumbai, June 21 -- The markets regulator on Thursday, 13 June directed credit rating companies to start disclosing the probability of default for the issuers they rate, troubled by the raters' track record of detecting defaults or near-defaults. Rating agencies also have to disclose factors that could potentially impact the rating of the instruments, which include an assessment of financials, the Securities and Exchange Board of India (Sebi) said in a circular published on its website. The credibility of rating agencies has been eroding since the global financial crisis in 2008 because of the conflict of interest arising from the fact that they are paid by the issuers to rate their securities and for their failure to downgrade troubled firm...