Last evening the Department was dispatched to the 100 Block of Stella Lane for a residential fire reported as the rear deck. EMS units arrived with smoke showing and no extension into the home. Engine 17 arrived confirming that report and downgraded the assignment to just the units on scene. A second emergency was received as the 1st assignment was downgraded for a Carbon monoxide alarm in the unit Block of Green Lane. Command sent E-10 @upperchifd10 and R-39 @lowerchifire who investigated. A faulty detector was found and the assignment was returned.