Investors in jumbo mortgage-backed securities face relatively low exposure to potential losses related to fires in California, according to an analysis by Moody’s Investors Service. The rating service said 2.9 percent of the outstanding mortgages in post-crisis jumbo MBS rated by Moody’s are in counties affected by the recent fires. And while some borrowers may suffer losses because of insufficient insurance coverage, Moody’s said hazard insurance and servicers’ ... [Includes two briefs]