What was found
FLT#1407, JFK-CDG. (ETOPS) 'IN CRUISE AT FL330 WE RECEIVED A VENT EXTRACT FAULT WE COMPLIED WITH QRH ANDCONTACTED MCC. A MUTUAL DECISION TO CONTINUE WAS MADE AS THE BLOWER WAS ON MEL; AEVC OPERATIONAL TEST CARRIED OUT IAW AMM 21-26-00 TEST SHOWS BLOWER FAN FAULT ONLY AS STATED ON MDDR 553979 (REMOVED AND REPLACED BLOWER VENT FAN ( 20HQ) IAW AMM 21-26-51, PEROFRMED OPS TEST IAW AMM 21-26-00-710-001, TEST OK, THIS CLEARS MDDR 553979, MX-4 UPDATED, PLACARD REMOVED).