The power steering pump may develop a leak requiring replacement of the pump.Google+
Car Problem Reports
Toyota Cressida Power steering pump may leak and require replacement
Toyota Cressida Problem
Visitor, 1990 Toyota Cressida, 93,000 mi
Fluid leaking from bottom of power steering unit. Mechanic told me so. Too much $$$ at the time, so keep adding fluid and keep drip pan under it.