2002 Lexus RX 300 Check Engine, Track, and VSC Lights on

2002 Lexus RX 300

Dashboard 'Check Engine', 'Track' and 'VSC' warning lights on. This is the third time this has happened. First time, around March 11th. Dealer inspected EVAP system, Replaced purge VSV, and Duty Vacuum(?). Second time, around April 29 found improper venting in canister and replaced canister. Third time was today, May 27.

Any sense of where we might go from here?

Thank you....