(Gresham, OR)  --  Gresham police say they've broken up a major burglary operation and closed a dozen burglary cases that had been unsolved.  FOX-12 reports the arrests resulted from a six-month investigation, which was launched after appliances were stolen from several vacant, for-sale, and remodeled homes.  An arrest was made during a burglary in progress in January, and that led to five more arrests.  Police say thousands of dollars' worth of stolen property has been recovered.