What was found
ENCOUNTERED TURBULENCE DURING CLIMBOUT AND GOT A MASTER WARNING FUSELAGE DOORS INDICATION. CHECKLIST WAS RUN AN INITIALLY PRESSURIZATION INDICATED NORMAL FROM 7,000 TO 12,000 FEET. DOOR INDICATION WENT AWAY AND 5 TO 10 MINS LATER ANOTHER DOOR WARNING WITH SLIGHT CABIN PRESSURIZATION CHANGES EXPERIENCED BY THE AFT F/A AND ROW 19 PASSENGERS. DOOR APPEARED VISUALLY CLOSED BUT INDICATION ON MFD / WARNING PANEL SHOWED OPEN. RETURNED TO FIELD. LANDING UNEVENTFUL. INSPECTED AFT SERVICE DOOR, NO DEFECTS FOUND. PERFORMED OPS TEST OF AFT SERVICE DOOR IAW AMM TASK 52-41-00-710-801. OPS TEST OF DOOR GOOD. GROUND PRESSURIZATION OF ACFT PERFORMED IAW AMM TASK 21-00-00-863-801. ACFT PRESSURIZED NORMALLY. WITH NO DOOR WARNING ABNORMAL AIR LEAKS AT DOOR. RETURNED TO SERVICE.