+1 on loosening the eight bolts and realigning the x carriage.

RobH2 - I have never been able to print that arch because as soon as it bridges from side to side at the top the tension pulls the small piece off the bed. if I set the settings so the bridges aren't stretched at all they sag and look terrible. I see you added a foot to the outboard end. is there a secret to being able to bridge this properly?