Need help identifying missing components from logic board for USB
I have a macbook pro 15" a1286 with the 661-6492 logic board. Its the mid 2012 non retina i7 model. I was doing a repair on the keyboard and it seems that unfortunately two components broke off the board adjacent to the usb ports. These two components clearly have something to do with the USB ports as they both no longer function. I am fairly certain these are the only two components needing replacement, and I can see the pads have not been ripped off just the components.
From pics I found of these logic boards one looks to be a diode (it was all black so could be a resistor too however it was pretty big) and has two legs whereas the other has four and is most likely an IC or transistor.
I am a EE and have all kinds of soldering/reflow equipment, but its useless without knowing what the components are. I have been scouring the internet for the schematic but all the sites I've found that have it want money for it. Any help is greatly appreciated.
Is this a good question?