Lisinopril and liver problem

I have been on Lisinopril and a diuretic for about 1.5 years -- started with 5mg of lisinopril. At first had a slight cough, but went away. In Feb 2008 routine blood tests were done and my ALT - liver enzyme was slightly elevated to 36. ( last test in 2003 was normal) --- had the test repeated in Aug 2008 and the ALT was up to 41. Doctor was not too worried, not very elevated - but I persisted as to why and she sent me for an ultrasound that showed all was normal for my liver, spleen, gallbladder, kidneys. My pressure was up a bit at the Aug appt - so she increased my Lisinopril to 10mg. I had another liver enzyme test done beg of Oct 2008 and now the ALT is up to 66. I told her the only difference is increasing my Lisinopril and that must be the cause for elevated ALT levels. She is not sure -- I am now being referred to a specialist -- but told to stop taking the Lisinopril for 3 weeks and they will see what the levels are. Have only seen a few mentions of elevated liver enzymes as a side effect -- has anyone else experienced?? My AST levels are normal.