I ditto the recommendation to go see a hepatologist. There are some diseases that "silently" affect the liver, including less commonly know tick borne diseases like HME (erlichiosis) and Bartonella (b.henselae).
Are you overweight, drink alcohol, Certain prescription and over-the-counter medications can be the cause,
Try milk thistle, Also try liver detoxification
It's important to speak with a doctor first about treatment for elevated liver enzymes I suggest seeing a hepatologist doctor
Probably to check out nothing else was going on, may have been a virus ..they are just being cautious I expect ..good luck