As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU - CREW REPORTED CAPTAINS AIRSPEED INDICATOR BECAME UNRELIABLE INDICATING FASTER AND ERRATIC. EMERGENCY DECLARED RETURNED SJU LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED AIR DATA MODULE THAT WAS FAULTY. SYSTEM GROUND CHECKED NORMAL OPERATION.