Dan, its a bit risky but I did it with success. You may do it on your own risk!!!
Set the supply to 3.0 V and current limit to 200 mA. Remove all subboards and connect the bench power supply direct to Vdd and GND. I guess the voltage will drop. Check all IC connected to Vdd for temperature. If you find one hot or significant warm, his should be the culprit. If no IC is hot increase the current to 300 mA, maybe later 400 mA but not more. But be sure while increasing the current the voltage is not going over 3.0 V.
?
2 Ohm and 0.4 A will produce 320 mW heat, enough to feel it.
?
73 Ludwig
