As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 791 - SJU - RTF - CREW RECEIVED ECAM MESSAGE FOR AVIONICS SMOKE AFTER TAKEOFF. NO SMOKE WAS EVIDENT. AIRCRAFT RETURNED TO SAN JUAN. MAINTENANCE FOUND UPPER PICCOLO TUBE DIRTY. CLEANED PICCOLO TUBE AND REPLACED AVIONICS COMPARTMENT SMOKE DETECTOR AS A PRECAUTION.