Why is my steering wheel still pulling left after alignment?

Firestone wheel alignment results

Vehicle: 2010 VW Jetta. 100k mi. Factory suspension and bushings. Tires freshly rotated and balanced, tread in the range of 5/32" to 7/32".

Recently replaced the driver side CV axle and the steering wheel is now pulling left. Took it to Firestone for a wheel alignment. Big improvement, but it's still pulling left after a couple hundred meters at 40mph.

I still have 12mo of warranty on the alignment. Should I bring the car in again?