NEW YORK--(BUSINESS WIRE)--Fitch Ratings has downgraded and removed three classes from Rating Watch Negative, downgraded one additional class, and affirmed 14 classes of J.P. Morgan Chase Commercial Mortgage Securities Corp (JPMCC) commercial mortgage pass-through certificates series 2006-CIBC17. A detailed list of rating actions follows at the end of this press release. KEY RATING DRIVERS The downgrades to classes A-4, A-SB, A-1-A reflect Fitch's estimated loss expectations, influenced by unce