As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE-OFF, TOWER NOTIFIED FLIGHT CREW OF POSSIBLE SMOKE TRAILING FROM LEFT WING. NO ABNORMAL INDICATIONS NOTED. ALL FLIGHT CONTROLS NORMAL. RETURNED TO DEPARTURE SUSPECTED FUEL LEAK, NO LOSS OF FUEL NOTED FROM LEFT TANK. FIRST OFFICER NOTED FUEL ON UNDERSIDE OF LEFT WING NEAR FUEL VENT THAT WASN'T PRESENT ON PRE-FLIGHT. R &R THE LEFT WING LOWER FUEL PANEL VENT IAW AMM.