What was found
AFTER CLOSING MCD ON TAXI OUT IN MCI, AN ACRID ODOR BECOMES PRESENT IN COCKPIT, AFTER TURNING ON PACKS, ODOR REMAINS FOR 5-10 MINUTES. RETIGHTENED GROUND INTERCONNECT LINES, RAN PACKS FOR 30 MINUTES, NO ODOR DETECTED, OPS CHECKED NORMAL IAW M/M 21-21-0 & 20-80-01.