What was found
AIRCRAFT WAS GROUNDED: IN CRUISE LOUD HUMMING IN FRONT OF AIRCRAFT, ALONG WITH A SLIGHT VIBRATION IN DESCENT BACK TO 310 FROM 350. REVIEVED AN ECAM VENT BLOWER FAULT AND CREW PUT BLOWER IN OVERIDE PER PROCEDURE, THEN 10 SECONDS LATER FAN AGGRESIVELY STOPPED NO HUM OK VIBRATION. FLIGHT ATTENDANTS REPORTED A WAXY CRAYON SMELL 5 MINUTES AFTER VENT BLOWER FAULT. SUPPLEMENTAL REPORT FOR AALA202304219442: MAINTENANCE REPLACED THE AVIONICS VENT BLOWER FAN PER AMM 21-26-51 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK. ** (CLOSED)