HK AVR80 receiver idle current

I want to measure/adjust the idle current of my old HK Avr80 receiver. It uses a dual resistor (3 legs) with 0.18 ohm value. Service manual says target value is 7.2mV (20mA). Should I measure the idle current across from the middle leg to one of the outer legs of the resistor or should I measure it across both end legs of the resistor? The manual didn’t specify where to connect the test leads of the multimeter. Thanks for the help!