Celina firefighters work inside a fire-damaged service bay this morning at A.J.'s Auto & Repair, 415 W. Logan St. Eleven firefighters, three trucks and a rescue unit responded after a passerby called at 7:07 a.m. to report visible flames. The fire extended into the attic and the cause remains under investigation, according to fire chief Doug Wolters. Business owner Ancil Hamblin reportedly has insurance coverage with damage listed as moderate.