Clean up area motor - filter motor - carbon bursh room from dirty of dust from dirty of dust. Measure actual long every carbon brush found long carbon brush1: 38.89 cm 2: 38.73 cm 3: 34.10 cm 5:39.82 cm 6: 31.83 cm7 cm: 46.41 cm  8: 43.60 cm 9: 45.54 cm 10: 45.24 cm 11: 43.85 cm 12: 40.34 cm 13: 33.86 cm 14: 28.88 cm 15: 33.28 cm 16: 42.97 cm 18: 25.78 cm 19: 36.46 cm 20: 39.92 cm 21: 40.03 cm 22: 34.70 cm 23: 43.82 cm 24: 43.90 cm. Replace carbon brush 3-6-13-14-15-18-22 with spare carbon brush ( EDI & ADI )