Elevated ALT and AST after taking asacol

Male, 71 in generally good health, physically active, slim build.   IgA nephropathy apparently in remission, high cholesterol without statins.

6 months ago I started taking asacol (4x 400Mg/day) for proctitis diagnosed by colonoscopy.  

This week a routine blood test found AST of 77 and ALT of 96.  A retest confimed the numbers.  A routine test just before I started the asacol gave results in the twenties for both numbers.  I happen to have  results going back 16 years, all results were in twenties or less.  I have no physical symptoms.

I have been taking lipitor for many years with no side effects.  I have been on a dose of 80Mg for at least 3 years and had liver function tests every 6 months.

Could the lipitor suddenly affect my liver?  Could the proctitis itself cause the elevated liver functions?

I drink only moderately - wine with dinner.

Any suggestions?