Hose connections can start seeping and water pumps (mechanical) can start to go bad(leak), esp if someone added tap water to the coolant. There is a TSB for a coolant hose rubbing but this is for the very early 05s and does not say if it applies to the hybrid.

Ducit Amour Hybridae
Mark Smith
Master Certifited Technician
Tempus non reparabilis fugit
"It isn't pollution that's harming the environment. It's the impurities in our air and water that are doing it."

Best Tank 35.0 MPG