As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD T088/28 EN ROUTE ORD TRAILING EDGE FLAP DISAGREE LIGHT ILLUMINATED DURING FLAP RETRACTION. ORD MAINTENANCE EXERCISED FLAPS SEVERAL TIMES ON GROUND. NO LIGHT ILLUMINATED DURING RETRACTION. UNABLE TO DUPLICATE. SYSTEM GROUND CHECKED NORMAL OPERATION. --CLOSED--