What was found
SFO - ACFT REPORTED TO ROLL AFTER TAKEOFF WITH FLAPS IN TAKEOFF CONFIGURATION. NO ASSOCIATED FLAP WARNING INDICATION REPORTED. ACFT ROLL TENDENCY RESOLVED AFTER CREW RETRACTED FLAPS. PROBLEM REOCCURRED ON LANDING WITH FLAPS SELECTED TO 25 DEGREES. FLAP DISAGREEMENT WARNING ASSOCIATED WITH SECOND EVENT. MAINTENANCE FOUND RT O/B FLAP ACTUATOR FAILS TO EXTEND PAST 25 DEGREES. REPLACED FLAP ACTUATOR. FLAP SYSTEM OPERATIONAL CHECK NORMAL ON GROUND. ACFT RETURNED TO SERVICE. (W)