Dave Smith posted an answer for this Denon AVR-681 Receiver:
"Problem: 1 Ohm 1/4 watt resistors not properly design-rated for circuit. REFDES:..."
Dave Smith posted an answer for this Denon AVR-4800 Receiver:
"R141-R142, R148-R149 Replace with 2.2 Ohm 1 watt Flameproof resistors. (4 Places)"