Vaccuum leak?

Four months after getting a bad air/fuel sensor diagnosed and replaced, thus ending weeks of the "check engine" light (along with VSC and tractio control lights), the "check engine" light has returned. I took it to Advance Auto Parts for diagnosis on the OBDII.

Code came back: P0442 EVAP Emission Control System Leak (Small).

I could not find an obvious leak, and even tried spraying brake cleaner around all areas under vaccuum (I don't know if this old trick is even useful on this vehicle). Does anyone have a suggestion of how to locate the leak, or know a likely culprit for this problem?

Thanks in advance for any help you can provide.