NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed 17 classes of COMM Mortgage Trust commercial mortgage pass-through certificates series 2006-C7. A full list of rating actions follows at the end of this release. KEY RATING DRIVERS The affirmations and removal of class A-M from Rating Watch Negative reflects sufficient credit enhancement (CE) relative to Fitch expected losses due to additional paydown and defeasance since Fitch's last rating action. Fitch modeled losses of 14.7% of the remai