[MarkR171]

Update: 9/26/2016

I called the service manager today (working directly with the manager now rather than the advisors.) He mentioned a guy from Toyota NA and a tech from the dealer chain's Subaru dealer came by to listen to the car. They thought there may be some debris in the oil system causing the VVT system to rattle, so the Subaru tech recommended disconnecting the cam gear and running the engine without it. The service manager told me that the noise goes away completely with the cam gear disconnected. I don't know what that means exactly, as I don't think the engine can run without it, but maybe the oil control valve was disconnected or something allowing the chain to spin. Not sure.

Toyota NA is sending another engineer to the dealership to work on the car. They are going to inspect the oil system for debris and the vvt components for any damage to see what is causing it to rattle a second time. The service manager says I should hear again "very soon" about what they're going to do. I'm hoping to hear back in the next couple days at the latest.