As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU INFLIGHT - JFK TO SDQ - SLAT POSITION INDICATION REMAINS AT ZERO WHEN SLAT FLAP HANDLE IS MOVED. LANDED SJU WITHOUT INCIDENT. CHECKED AND LUBRICATED ALL RIGHT AND LEFT SLAT JACKSCREWS. RESET BOTH SLAT FLAP CONTROL COMPUTERS. SYSTEM GROUND CHECKED NORMAL OPERATION.