What was found
AIRCRAFT RETURNED TO PLATFORM, (T/O WARNING) ALARM WAS ACTIVATED. PROXIMITY SWITCH WAS CHECKED AND 3 FLAPS/SLATS CYCLES WERE PERFORMED, BUT FAIL CONTINUED. CABIN PEDESTAL SWITCH WAS CHECKED AND SWITCH S1-492 WAS DETECTED BROKEN. SWITCH AND ACTUATOR JV20 WERE REPLACED AND TESTED IAW MM 27-53-01, ALL CORRECT. DURING OVERNIGHT CHECK, TEST WAS PERFORMED IAW MM 27-53-01, ALL CORRECT.