As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IMMEDIATELY AFTER TAKEOFF MASTER WARNING FOR DOOR EMERGENCY LT OPEN. PRESSURIZATION NORMAL. FROM EXTERIOR IT DOES LOOK AJAR. HANDLE PANEL INDENTED. MAINTENANCE FOUND LEFT OVERWING EMERGENCY EXIT ESCAPE HATCH ONLY PARTIALLY LOCKED AND SECURE. REMOVED AND INSTALLED OVERWING EMERGENCY EXIT HATCH IAW AMM 52-21-00. CHECKED OK.