As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLAP EXTENSION, NR 4 KRUEGER FLAP FAILED TO EXTEND. COMPLETED ABNORMAL PROCEDURE AND LANDED. ON SHORT FINAL NR 4 KRUEGER FLAP EXTENDED. REMOVED AND REPLACED NR 4 L/E FLAP POSITION SWITCH, OPS CK NORMAL IAW B727 M/M 27-82-01 AND 27-82-00.