As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ON APPROACH TO LAND AT KXBP BASE TO FINAL, THE CFII AND HER STUDENT HEARD A POP IN THE AIRFRAME. THEY NOTICED THE LEFT FLAP WAS "FLAPPING" A LITTLE AND DIDN'T SEEM TO BE SECURED IN THE PROPER CONFIGURATION COMPARED TO THE RH SIDE. THE CFII TOOK CONTROL AND LANDED THE PLANE WITHOUT INCIDENT. A LOCAL A&P MECHANIC HELPED THE PILOTS DISCOVER THE LH FLAP CABLE BROKEN AT SWAGED END.