What was found
CABIN ODOR PRIOR TO FLIGHT, TROUBLESHOT THE CABIN AIR QUALITY IAW TC 26L000021001. MAINTENANCE ACCOMPLISHED JC 26L00021001, NO ODOR DUPLICATED. ISOLATED APU, NR 1 & 2 ENGINES AND THE PACK SYSTEMS, COULD NOT DUPLICATE ODOR AND PERFORMED SATISFACTORY OPERATIONAL CHECK. AIRCRAFT WAS GROUNDED