New Member with Maintenance Questions (60,000mi)

[Whammy]

Hello all,

My wife has a '13 X5 Xdrive 35i (N55 motor). As of late, I've wanted to learn more about the platform because I am starting to service it. I have an '03 E46 ZHP that I drive during the summer and a '03 4Runner for winter duties. So, I'm not new to BMW vehciles. My wife's X5 is at 60,000mi. I have already changed the oil this past weekend but need to do a bit more work. From what I can tell, here is what I think needs to be done:

Spark Plugs -ZR5TPP33S
Air Filter - 13717571355
Accessory Belt - 11287628659
Diff Fluid - 07512293972

Is there anything I am missing from the maintenance work?

Also, while performing a little bit of research, I found a video which shows how to change the spark plugs (though it was a bit of a reverse video). Has someone written a thread about changing the spark plugs on the N55 motor?

Thanks for the help!