I have read through these posts. I am not a Raymond guy. I have a code 23, and after investigation the drive motor brushes were worn but only half of the brushes were. I had the motor freshened and still had code 23. I have 1 ohm on the 2 resisters, 3.5 volts through my diode. Checked all cables and checked the heat sink insulator. Can someone help me with the raymond term, is the rec the black gate on the heat sink, I checked that, 50 ohms between the ground and gates I guess, and not sure what the q1 is. On the heat sink I have 24 volts with my positive lead. Hope you raymond guys can help me out.