It may mean nothing, there needs to additional tests again in a few months, to see if the elevations are still there. Then the investigation may start.
These elevations indicate a biliary system issue, but that can be many things. My ALP is always elevated, many years though. The fact that your ALT is not elevated, or only mildly so, means that your bile flow isn't impeded much, a good thing. As the bile flow out of your liver gets blocked, the bile backs up and destroys portions of your liver, causing your ALT and AST levels to become very elevated.
Do see your doctor though to discuss things.