As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON FLAP RETRACTION AFTER TAKEOFF L/E FLAPS TRANSIT LIGHT FLICKERED, NR 1 L/E SLAT ANNUNCIATOR INDICATED FULL EXT, L/E FLAPS TRANSIT LIGHT EVENTUALLY REMAINED ILLUMINATED. REPLACED FLAP/SLAT POSITION SWITCH UNIT MODULE AND PERFORMED A TEST WITH L/E FLAP/SLAT BREAK OUT BOX -10M8546. OPS CHECKED OK PER MM27-88-000-101.