Power Transfer Unit Leaks From the RH Side
WARNING: This page is about a different car, the 2018 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
If the leak is automatic transmission fluid, the power transfer unit intermediate shaft seal needs to be replaced. This is outside on the RH side of the power transfer unit. REFER to: Intermediate Shaft Seal . A worn or damaged intermediate shaft bushing can cause the intermediate shaft seal to leak transmission fluid, inspect the intermediate shaft bushing and replace as necessary. REFER to: Intermediate Shaft Bushing .
If the leak is brown/black gear lube at the case to cover seam, the power transfer unit larger cover seal needs to be replaced. This is located on the power transfer unit cover.