Power Steering 2003 Durango

I took my 2003 Durango to two places to have a front end lineament, both said they
said they could not do the lineament because of a internal problem steering problem
and they could not tell me what the problem is. I have also have had problems with
the power steering being hard to turn and recently when it is cold in the morning it is
like there is no power steering for the first 2 to 3 minutes ,afterwards the steering is
easier to turn, but the steering still remains somewhat to  hard to turn