Power steering extremely tight when initially started. Why? on 1998 Mercury Grand Marquis

98 gr Marquis when initially started it is hard to steer. Very tight unlike normal. After a bit it loosens up. What could cause? I just had maintenance done an oil chafe with all fluids checked. I'm stumped!

Asked by for the 1998 Mercury Grand Marquis
Power steering pump could be failing and may need replaced or the filter may be clogging up.