I am going through this again!! My thermal cutoff keeps opening. I cleaned they exhaust line. I even leveled the dryer thinking that because it was leaning forward all the clothes were clumping by the lint screen area impacting air flow. I just ordered a generic thermistor as when I test the one o have it seems to be reading much higher than 11k. I also ordered a digital multimeter as my analog one ohm scale is not useful. I have been fighting my dryer for years! I may just check the drum wheels next based on the idea about the pulley someone mentioned.