Hi Elizabeth. I would say that your plant has been chilled and think you've done the right thing in bringing it in a warmer place. Only problem being, they do enjoy bright conditions. Maybe you could move it some where with a bit more light ?
They are not sulky plants so will not mind being moved again . As they age , some of the lower leave fall off and you are left with a little trunk but the new leaves carry on growing from the top - a bit like a yucca.
Are the yellowing leaves confined to the bottom of the plant or are others affected as well ?