Error 35 occurs. The opto-board has either failed or could have been contaminated with oil. The black plastic unit is a “Slotted optical switch” and contains a light source (LED) on one side (S) and a detector on the other. If contaminated with oil, the oil will prevent the light from reaching the detector.
Resolution
Replace the opto-board. Download the following PDF for detailed instructions on replacing the opto-board.