The $356.40 million jumbo mortgage-backed security JPMorgan Chase issued in February 2014 has performed well, according to Kroll Bond Rating Agency. Since issuance, the rating service said JPMorgan Mortgage Trust 2014-1 has experienced minimal delinquencies, no credit-based loan modifications and no losses. As of the end of January, the MBS had an unpaid principal balance of $202.30 million and one mortgage in the deal was 30 days ... [Includes two briefs]