What was found
AIRCRAFT 0192, STRONG FUMES IN AFT GALLEY AREA INCLUDING LAST PAX ROW AFTER ENGINE START. RETURNED TO GATE. CORRECTIVE ACTION: ALL CKS NML, UNABLE TO DUPLICATE FAULT AT THIS TIME. INSPECTED AND REPLACED RECIRC FANS FILTERS AS PRECAUTION PER B767-300 AMM 21-25. RAN BOTH ENGINES ON IDLE PER B767-300 AMM 80-00, OPS CHECKED BOTH PACKS PER B767-300 AMM 21-51 AND CYCLED ALL FLIGHT CONTROLS PER 767-300 AMM 27-00, ALL CKS NML AT THIS TIME. (LP 5330514)