As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT THE AIRCRAFT WOULD NOT ACCELERATE AND A RUMBLE COULD BE HEARD AND FELT. THE CREW INSPECTED THE WINGS DURING FLIGHT AND FOUND THE FLAPS SLIGHTLY EXTENDED WITH A ZERO INDICATION IN THE COCKPIT. THE FLAP HANDLE WAS CYCLED AND THE FLAPS FULLY RETRACTED AND THE NOISE STOPPED. THE AIRCRAFT RETURNED TO IAH AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE FLAP HANDLE WITH NO FURTHER DEFECTS NOTED.