As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN REPORTED THAT DURING CRUISE AT 400 FL, LE FLAPS TRANSIT AND FULL EXTEND SLAT NUMBER 1 LIGHTS ILLUMINATED. MAINTENANCE PERFORMED BITE TO FSEU IAW FIM 27-51 TASK 801 PROCEDURE, SHOWING FAILURE AT POSITION SENSOR OF SLAT NUMBER 1; SO THE PROXIMITY INBOARD SENSOR OF SLAT NUMBER 1 WAS REPLACED IAW AMM 27-88-11 AND SLAT PROXIMITY TEST WAS PERFORMED IAW MM 27-88-11, TESTED CORRECT.