'15 Outback - EPB connected to VDC?

[Fubaru]

The wife's 2015 Outback 2.5i Premium w/150k is currently at the dealership  with an EPB warning light on and an issue with the left rear parking brake sticking (the recall was already fixed).  The service desk claims the VDC hydraulic unit and the right side of the harness needs to be replaced.  From what i've researched, the EPB is entirely electronic/mechanical on this vehicle and not included in the hydraulic system.  It also makes no sense to me that the right side harness would cause left sided failure of the system.  It's not having a stroke.  Part #s-  VDC H/U #27596AL00E  & harness #26018AL02B.   If anyone can confirm or deny the service desk's claim I'd be more than appreciative.  We really don't have $1200 to flush right now.