What was found
FLAP SYSTEM 1, 2, FAULT ON OVERHEAD PANEL ON ECAM. ATTEMPTED TO CYCLE FLAP HANDLE BUT PROBLEM REMAINED. FOLLOWED QRH RETURNED TO DEPARTURE. HAPPENED WHEN FLAPS 15 SELECTED. FLAPS APPEARED STUCK APPROX 13-14 DEG, WOULD NOT MOVE PAST THAT. ACFT BELOW MAX LANDING WEIGHT. CHECKED SFCC'S FOR FAULTS. BOTH 1 AND 2 SFCC SHOWED FAULT, BALLS CONSISTENT WITH "FLAPS JAMMED". FOUND LT SYS TORQUE LIMITER INDICATOR POPPED. NR 2 LT SHAFT AND JACKSCREW. DRAINED OIL AND FOUND OIL VERY BLACK (OPAQUE) WITH SOME METAL SHAVINGS, REF TSM 27-50-02. REPLACING NR2 JACKSCREW. CHECKED REMAINING JACKSCREWS .