As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH INTO MDW THE FLAPS STOPPED AT 8 DEGREE WHEN SELECTED TO 15 ON THE LEVER. DIVERTED TO MKE AND FLAPS WORKED USING ALTERNATE FLAP SELECTOR TO 15 DEGREE. REMOVED AND REPLACED FLAP POSITION SENSOR, PER AMM 27-58-01. OPERATIONS CHECK GOOD ISSUE NR 3078754 POS/LT TAG/701440 P/N OFF/ON 18-1738-12 S/N OFF 5619 S/N ON 2235.