What was found
TPA - FLT 984 - AFTER TAKEOFF, CAPTAIN WAS UNABLE TO PRESSURIZE AIRCRAFT. FORWARD ENTRY DOOR WAS NOT SEALING PROPERLY IN CLOSED POSITION. FLIGHT RETURNED TO FIELD AT TPA. NO EMERGENCY WAS DECLARED AND THE FLIGHT LANDED WITH NO FURTHER INCIDENT. MAINTENANCE CHECKED AND OPERATED FORWARD ENTRY DOOR SEVERAL TIMES. OPS CHECK NORMAL. LUBED DOOR SEAL AS PRECAUTION. CHECKED PROXIMITY SWITCH. OPS CHECK NORMAL. (M)