What was found
JFK FLT 279 EN-ROUTE EDI - JFK. THE AIRCRAFT WAS GROUNDED SMOKE/FUMES/ODOR IN CABIN AIRCRAFT /L/ SIDE AFT VENT ONLY. FUMES DISSIPATED WITH LEFT RECIRC FAN SELECTED OFF PER STEP 9 OF THE QRH CHECKLIST (SMOKE, FIRE OR FUMES). RESEMBLED AN ACRID SMELL. (AFT GALLEY). MAINTENANCE ACCOMPLISHED ATBT SIC 05-96-70 SMOKE ODOR. REPLACED RECIRCULATION FAN BASED ON PILOT DEBRIEF AND PIREP. PUT AIRCRAFT IN THE AIR MODE FOR CHECK OF DOOR SUPPLEMENTAL HEATERS , OPERATION NORMAL. (REF AMM 21-45-00, 21-25-01, 25-32-00).