As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING STALL RECOVERY WORK, THE FLAPS WERE BEING MOVED TO A 20 DEGREE POSITION WHEN THE LEFT FLAP RETRACTED TO FULL UP TRAIL POSITION AND RIGHT FLAP REMAINED DOWN (THIS OCCURRED AFTER A LOUD BANG). THE ACFT ROLLED LEFT. PILOT INITIATED EMERGENCY PROCEDURES AND LANDED PLANE. LEFT FLAP CABLE BROKE AT SWAGED BALL END.