As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK FOR "AVIONICS SMOKE" ECAM. NO EMERGENCY DECLARED. FOUND WATER IN AVIONICS SMOKE DETECTOR. R & R AVIONICS SMOKE DETECTOR AS REQUIRED. OPS CHECK GOOD REF MM 26-15-12-04-0. PREMATURE REMOVAL/INSTALLATION. NOTE: PREV WRITE UP AT GATE - WATER CLEANED FROM DETECTOR.