What was found
APU GENERATOR DISINTEGRATED, DAMAGING AFT SHEET METAL. DAMAGE ACCOMPANIED WITH FIRE. REPLACED APU AND AFFECTED SKIN AND FRAMES, RT DOOR, APU HARNESS, INLET DUCTING, COOLING DUCTING, AND POWER FEEDERS WERE REPLACED. SUBMITTER STATES, SUSPECT GENERATOR SENT TO OEM FOR TEAR DOWN AND INSPECTION TO DETERMINE CAUSE OF DAMAGE.