Arlington Heights police and firefighters were busy managing safety hazards related to power problems in Arlington Heights Monday morning. A line was reported down in the back yards of the 900 block of North Highland about 9:30 a.m. Monday. Next, reports of stoplights out along Northwest Highway in downtown Arlington Heights started coming in to Northwest Central Dispatch. Several fire alarms and burglary alarms also showed trouble. Com Ed worked to repair the electric power trouble.