As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU - CREW REPORTED LOSS OF BOTH NUMBER ONE AND THREE INERTIAL REFERENCE UNIT'S AND SOME DATA INSTRUMENTS. EMERGENCY DECLARED, RETURNED TO SJU WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED NUMBER ONE INERTIAL REFERENCE UNIT. SYSTEM GROUND CHECK NORMAL OPERATION.