What was found
AIR TURN BACK, EQUIP DOOR LIGHT CAME ON @3000'. AIRCRAFT WOULDN'T PRESSURIZE.(<P>FOUND EQUIP DOOR FULLY OPEN WITH EQUIP LIGHT ON. CLOSED AND SECURED DOOR MULTIPLE TIMES. NO DAMAGE NOTED IN LOCKING MECHANISM IAW AMM 52-48-41. COMPLETED VISUAL INSPECTION IAW AMM 52-48-41. NO DAMAGE NOTED.</P>)