Does anyone know where the Quiescent Relay Box is, and what it does?

Doing some research, I believe it has something to do with battery drain and switching off components that are no longer required.

The IID says I have a fault code "B1412-96 (2F) Quiescent Relay Box - component internal failure", although the car doesn't seem to be experiencing any problems. If it is an easy replacement, it might be worth finding a 2nd hand replacement and swapping it out. Current:
- 2017 L405 3.0 V6 Autobiography
Sold:
- 2013 L405 4.4 TDV8 Vogue
- 2004 L322 4.4 Vogue (BRC LPG)
- 2002 L322 4.4 HSE (having fixed timing chain guides)
- 2000 P38 4.6 Vogue (BRC LPG)
- 1981 2-door In-Vogue
- 1980 Ex-Army SIII LWB
- 1976 SIII LWB
- 1968 SIIA
Stripped for parts:
- 2003 L322 4.4 Vogue

Load space RH side take panel off where fusebox and the 2nd battery located.

https://www.fullfatrr.com/gallery/albums/u...eplace.pdf
https://www.fullfatrr.com/gallery/albums/u...earJB7.pdf 2018 SE SDV8 4.4 Byron Blue

Thanks for those...

I've also just found a TOPIx notification - SSM72286: B1412-96 Flagged in the Gateway Module which seems to imply that nothing is needed.

Click image to enlarge

 2018 SE SDV8 4.4 Byron Blue