As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK TO OAK, DUE TO R/T INBD FLAP INOP AT 1 DEGREE POSITION. FOUND RIGHT INBD FLAP TORQUE TUBE COUPLING DISCONNECTED. SECURED COUPLING, SAFETIED AND RIGGED IAW MM 27-51-01. GROUND FLAP OPERATION AND COCKPIT INDICATION CHECKS NORMAL.