What was found
ON TAKE OFF @ APPROX 100 KTS, MASTER WARNING FOR FUSELAGE DOORS ILLUMINATED. TAKE OFF WAS ABORTED AND NORMAL BRAKING USED. AFTER ABORT, AFT SERVICE DOOR INDICATED OPEN. FLIGHT ATTENDANT MOVED HANDLE AND DOOR THEN INDICATED CLOSED. REMOVED FROM SERVICE. INSPECTED DOOR HANDLE, PROX SENSOR, AND AROUND DOOR WITH DOOR CLOSED. NO DEFECTS NOTED. OPS TEST OF AFT SERVICE DOOR PER AMM 52-41-00-710-801 IS GOOD. HANDLE IS CLOSED, VENT DOOR CLOSED, ALL DOOR WARNINGS ARE OFF, AND MFD SHOWS DOORS CLOSED. NO DEFECTS NOTED AT THIS TIME. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.