Recently changed lens, camera now won't focus further than 20-30 ft.

Your CCD can not be involved with that problem or all your pictures would have that problem. The problem is in your optics or the mechanism operating them. More than likely since it had been jammed the motor or gears moving them. My first thought is that the system uses something to count the motors revolutions as part of the focus control. When you installed the new lens the motor may not have been retracted all the way. I would try to reseat the optics, it sounds like you are part of a revolution, perhaps a tooth in a gear off.