During a phase inspection, the technician discovered the flame retardant (fire block) on the aft carpet (P/N 0715093-2) was breaking down and coming loose. 

The technician discovered the fire block had settled into the overlapping seams of the floorboard and the floorboard structure. He also found signs of corrosion in the areas where the fire block had accumulated.

The submitter stated that if this defect was left unattended, it would cause further metal deterioration.

Part total time-1,790 hours.