What was found
IN FLIGHT AFTER TAKEOFF, GEAR THEN FLAP RETRACTION HYD PRESS ANNUNCIATOR REMAINED ON. CYCLED FLAPS & GEAR LIGHT REMAINED ON. ON LANDING PREP AFTER GEAR EXTENSION HYD PRESS LIGHT WENT OUT AT 170 KTS. AFTER LANDING & FLAP RETRACTION HYD PRESS LIGHT STAYED ON. PULLED HYD PRESS CB & LIGHT STAYED ON. APPLIED POWER TO ACFT & PRESSURIZED HYD SYS. WITH FLAPS RETRACTED & GEAR IN DOWN POSITION, THE HYD PRESS LIGHT REMAINED ILLUMINATED. WHEN FLAPS ARE SELECTED TO ANY POSITION OTHER THAN CLEAN, FULL UP & HORIZONTAL STAB MOVES TO TAKEOFF POSITION THE HYD PRESS LIGHT WILL EXTINGUISH. SUSPECT HORIZONTAL STAB UP LIMIT SWITCH, ST041, TO BE AT FAULT. FURTHER TROUBLESHOOTING REQUIRED. REMOVED LT FLAP ACT & FOUND SWITCH STUCK CLOSED. R & R LT & RT FLAP ACTUATORS & SET LOCKING PRESSURES. COMPLIED WITH FLAP TRAVEL CHECKS & LEAK CHECKS IAW CE-560XL MM CH 27-51-00, NO DEFECTS NOTED. LT FLAP ACTUATOR ASSEMBLY, PN 9912007-1 & SN 2040, RT FLAP ACTUATOR ASSEMBLY, PN 9912007-1 & SN 2039.