I'm trying to locate this Positive Gross Current Limit circuit (Voltage clamp) on an "A1' board used that is used on the 66309D, 6611-6613C power supplies. No U# and I probed every diode I could find WRT D321 Anode and I can't find it. I'm pretty sure The ?? voltage clamp is pulling down the signal at its anode, however no luck finding it on the board.