What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND THE EMERGENCY ABSORPTION SYSTEM QUADRANTS DAMAGED FROM IMPROPER INSTALLATION OF PLUG ON SEATS 8D, 10CD, 13D, 14D, 15D, AND 17D. MAINTENANCE REMOVED AND REPLACED THE QUADRANTS IAW EMB 170 CMM 25-22-50. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.