Arduino MEGA2560 USB parts identification

[johnwasser]

Without looking at the circuit, I'll stick my neck out and say that looks like 22 ohms in "resistor network '2D'".

On the schematic it looks like there are five resistor networks:
RN1: Quad 10k (one is unused)
RN2: Quad 22 Ohms (two are unused)
RN3: Quad 1k (one is unused)
RN4: Quad 1k
RN5: Quad 10k (one is unused)