OK I have a 2019 Subaru Outback Premium and posted on Subaru outback.org the same issue But they have revised the service bullitin to 8/20/19 and I took mine to the dealer a week ago and they just called to say they got a box of springs as this is becoming more common.
Rattling Sound from EPS Gear Box – 2015-2021 Subaru
NHTSA ID Number: 10164192
Manufacturer Communication Number: 04-17-17R
The repair (when applicable) involves installation of a new tension spring for the worm gear to reduce / eliminate the condition. It should be noted the condition is NOT detrimental to the operation of the EPS system.
https://static.nhtsa.gov/odi/tsbs/2019/MC-10164192-0001.pdf
17 Affected Products
Vehicles
MAKE MODEL YEAR
SUBARU LEGACY 2015-2019
SUBARU OUTBACK 2015-2019
SUBARU WRX 2015-2021
Just wanted to share - I'm not scheduled until Feb. 7th t0 have it replaced. I will post after.