What was found
TPE - AFTER T/O, FLAPS WERE VERY SLOW TO RETRACT, FLAPS/SLATS STUCK AT ZERO DEGREES. FOLLOWED EMERGENCY/ABNORMAL PROCEDURE AND RETURNED TO TPE. FLAPS RETRACTED TO ZERO DEGREE DETENT ON THE GROUND AND THE FLAP SYS NR 1 FAULT LIGHT ILLUMINATED. REMOVED AND REPLACED HIGH SPEED SOLENOID VALVE, WORKS OK (P/N 500A000-03), OFF (S/N 03601). BITE TEST ON SFCC NR 1, ALL OK PLACARD REMOVED AND NOTIFIED MOCC.