This is to inform you that as we finished disassembled the 6.01 end shield with yoke ring and with poles of exciter, we found that the poles of exciter its seems that it was burned out as you can see in the picture and also the 8.22 rotor core with winding of exciter was also burned as you can see in the picture, At any rate we cleaned by electro-clean eco quick chemical the poles exciter and the 8.22 rotor core with winding of exciter. After cleaning and dry we checked again the megger insulation resistance but unfortunately still the same result as before 0.00 MΩ and 0.05 MΩ. Attached herewith is the photo for your references. Also in 6.01. Awaiting for your further advice. 6.01 END SHIELD WITH YOKE RING AND WITH POLES OF EXCITER