What was found
PDX - ON TAKEOFF AT 100 KIAS MASTER WARNING FUSELAGE DOORS, ABORTED TAKEOFF. ON E/A CHECKLIST R2 DOOR SHOWED UNSECURE. DURING DISCUSSION WITH F/A, F/A STATED; CHECKED THE R2 DOOR AND THE HANDLE MOVED A SLIGHT AMOUNT. AFTER THIS DOOR ANNUNCIATOR SECURE (GREEN). PERFORMED OPERATIONAL TEST OF AFT SERVICE DOOR IAW Q-400 AMM TASK 52-41-00-710-801. OPS CHECK GOOD. NO OTHER DEFECTS NOTED AT THIS TIME. RETURNED TO SERVICE. NO PARTS REPLACED.