As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A FLAPS FAIL AT 20 DEGREES WARNING MESSAGE AFTER TAKEOFF. CREW ELECTED TO RETURN TO LEX AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND PERFORMED A FUNCTIONAL TEST OF THE FECU BIT TEST SKEW DETECTION. SYSTEM OPS CHECKED GOOD AND MESSAGE CLEARED IN ACCORDANCE WITH THE AIRCRAFT MAINTENANCE MANUAL. AIRCRAFT WAS RELEASED FOR SERVICE.