What was found
AIRCRAFT WAS GROUNDED: AIRCRAFT WAS GROUNDED: DURING CLIMB APPROXIMATELY 1800 FT., FLIGHT ATTENDANT REPORTED LOUD AIR LEAK NOISE. PRESSURE SYSTEM APPEARED NORMAL, BUT CAPTAIN REPORT THAT AIRCRAFT WAS NOT PRESSURIZING. RETURNED TO DFW (NOISE FROM FORWARD ENTRY DOOR). FOUND THAT LOCKING DOOR L1 FULLY CLOSED FOR FULL LOCK IS NOT SMOOTH AND REQUIRES FORCE FOR FINAL FIT, FOUND DOOR HORIZONTAL CONTROL ROD THAT ATTACHES TO THE TORQUE TUBE TO BE OUT OF ADJUSTMENT. ADJUSTED HORIZONTAL CONTROL ROD ENDS PER AMM 52-11-00-820-801 ITEM K. AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.