What was found
UPON EVACUATION OF AIRCRAFT, AURAL WARNING SIGNAL FAILED TO OPERATE MID CABIN TO AFT CABIN. *S/D* THIS PROBLEM WAS NOT DUPLICATED. AFTER POWER WAS RESTORED, THE SYSTEM OPERATIONALLY CHECKED NORMAL. THE SYSTEM HAS ONLY ONE POWER SOURCE FOR THE FORWARD, CENTER AND AFT ZONES OF THE AIRCRAFT, MAKING IT IMPOSSIBLE FOR THE FAILURE TO BE RELATED TO LOSS OF POWER DUE TO THE OTHER AIRCRAFT PROBLEMS.