What was found
L1 DOOR NOT FULLY CLOSED OR DOOR LOCK MECHANISM NOT FULLY ENGAGED BEFORE TAKE OFF(<P>RETURNED TO AIRPORT, INSPECTED FOR DEFECTS, FOUND NONE. CLOSED DOOR, ENSURED DOOR MECHANISM WAS FULLY ENGAGED AND PRESSURIZED AIRCRAFT. NO DEFECTS NOTED, AND NO SOUNDS INDICATING AIR ESCAPING PAST DOOR SEALS IAW AMM 21-32-00 & 52-11-00</P>)