What was found
RETURN TO GATE DUE TO INEXPLICABLE AND CONTINUOUS SMELL OF FOOD COOKING AND NO FOOD ON BOARD. RAN BOTH ENGINES PER A220 WORKCARD # 0550-2001. SMELL STRONGEST FROM #1 ENGINE AT ALL POWER SETTINGS. #2 ENGINE SMELL FROM HIGH POWER SETTINGS APPROX. ABOVE 45% N1. UNABLE TO ISOLATE WHERE SMELL ORIGINATES FROM. (W.I.P JV 765702) PERFORMED EFIM TASK SOLUTION ID : 1-8449 "ELIMINATION OF RESIDUAL ODORS" WITH #2 ENG . ALL ODORS CLEAR OF CKPT/CABIN. (KJ 506839) CLEANED ENG OF OIL/ HYD (KJ 506839) R/R CASE DRAIN QD LEAK CHK C/O NO LEAK NOTED. (LP# 7230742)