What was found
SHORTLY AFTER TAKEOFF GOT A DISAGREEMENT ON INBOARDD FLAPS COULD NOT RESOLVE PROBLEM PER QRH. LOWERED LANDING GEAR THEN FLAPS CAME UP, BUT GOT A LOW PRESS LIGHT ON RIGHT HYDRAULIC RESERVOIR FOR 2 MINUTES, THEN IT WENT OUT. RETURNED TO SFO. CHECKED FAULT CODES ON FLAP PANEL. FOUND LEFT INBOARD FLAP NOT RESPONDING FAULT. SUSPECT BAD LEFT INBOARD ACTUATOR DUE TO RESIDUAL HYDRAULIC FLUID AROUND ACTUATOR. REPLACED LEFT INBOARD FLAP ACTUATOR IAW CARD RII 27-307. OPS CHECKS GOOD, NO LEAKS NOTED. ALSO REPLACED RIGHT RESERVOIR BLEED VALVE AND PRESSURE CHECK VALVE ON RESERVOIR. RAN BOTH HYDRAULIC SYSTEMS WITH NO LEAKS AND NO LIGHTS NOTED.