What was found
FOR FLIGHT 4654 BOTH FLIGHT ATTENDANTS REPORTED AN ODOR OF BURNING PLASTIC AT ROW 3 C+D. THE PASSENGERS ALSO REPORTED AN ODOR. THE APU WAS RUNNING PACKS ON AT GATE. THE AIRCRAFT WAS REMOVED FROM SERVICE. INSPECTED GROUND COOLING FAN PACKS AND INTERIOR OF AIRCRAFT. PERFORMED RUN UP OF ENGINE NR 1 AND INSPECTED CABIN FOR ABNORMAL ODORS NO DEFECTS NOTED IAW CRJ 700 72-10-00. THE AIRCRAFT WAS RETURNED TO SERVICE.