What was found
INSPECTION TYPE:N/A EMERGENCY DECLARED - SLATS EXTENDED FLAPS 10" TAKE OFF UPON LIFT OFF RECEIVED 4 LEVEL 2 "SLAT DISAG" ALERT (FLAP HANDLE REMAINED IN 10" DETENT) MID FOOT ON AIRSPEED TAPE BECAME DYNAMIC AS THOUGH SLATS RETRACTED UNCOMMANDED RAN QRH PROCEDURE. LANDED W/28" RET (QPER FIM 31-71-07-00-101 FIG 106 PSEU FAULTED "L #4 SLAT B" PROX. SENSOR GL 0558835 7-4-19 REMOVED AND REPLACED L #4 SLAT B SENSOR WITH REF TO MM 2784-03 ACCOMPLISHED ADJ/TEST WITH REF TO MM 27-84-00-501 TEST PASSED IPC 27-84-01-01-030A