Welcome to NeuroTalk:

There is a study online on PubMed, about B6 levels found surprisingly high in children with autism, taking no supplements.

I have it on my B6 thread here:
http://neurotalk.psychcentral.com/thread30724.html

Labs vary in the ranges they quote....some go up to 95 or so as normal. Also there is pyridoxine (inactive B6) in many foods today...mostly cereals, bread and pasta.

The test I believe will not separate out activated form P5P from pyridoxine (regular B6). So if you are NOT activating the pyridoxine you eat, it might build up.

Low alkaline phosphotase is better than elevated.
http://www.livestrong.com/article/40...e-phosphatase/
For what it is worth, I've had slightly elevated alkaline phosphotase levels all my life...not extremely high, but just out of range. 30+ yrs of it...nothing bad has happened to me!
No other liver tests are abnormal either.

I wonder if what your B12 levels are as well. Did you have that tested? did your doctor say "normal"? Well you could be low then because lab ranges in US are still reported low as normal.
The new cut off for normal is now 400pg/ml in US. (other countries report it differently). So call them back get your B12 number as well. Did you have Vit D done? You should also have this run and get the numbers for it.

Some tests get done improperly too. So after you get the numerical results, you might consider a retest in 3-6months.
Labs can make mistakes based on how they calibrate their instruments etc.