Spoiler alert - wheel imbalance

For several weeks I noticed a rattling noise after rotation.

I remember hearing that noise on a few youtube vids of 737s taking off, so I thought it was normal.

After getting an engine bleed fault during the last flight, I went in to clear the error in the FMC prior to the next flight only to discover a second active fail - a wheel imbalance.

So a tip of the hat to PMDG, pretty cool effect. And a heads up... if you hear a wheel rattling upon takeoff (there are no warning lights to tell you about the problem) , you might have to have the plane "serviced" at your next turnaround.