ARII R3 burning out under load

Bench testing our ARII without load shows all good voltages. Under load from the game board or a 2ohm, 20 watt resistor is rapidly heating up R3; a 33ohm 1/4 watt resistor. It burned all the way out once and then fried Q1, the LM305 voltage regulator. After replacing both, we can watch R3 rapidly heat up with a thermal camera again. We're unsure where to go from here. R29 and R30 are the commonly listed symptoms of issues, but I haven't seen anything on R3.

Thanks in advance