Some Zanesville residents were left in the dark for part of this morning. American Electric Power says just after 10:00 am around 16-hundred customers lost service after a power line malfunction. It happened in the Linden Avenue Dresden Road area and last four around 90 minutes. A-E-P says power was restored just before 11:30 this morning. The power outage also caused traffic problems on Maple avenue after some of the stoplights stopped working during the outage.