What was found
STRONG PLASTIC ODOR IN ENTIRE CABIN OF AIRCRAFT INFLIGHT. MAINTENANCE INSPECTED A/C INTERIOR, EXTERIOR, AND UNDER FLOORBOARDS FOR POSSIBLE SOUCE OR ODOR. NO DEFECTS NOTED. RAN A/C 20 MINUTES ON GROUND, NO UNUSUAL ODORS NOTED BY EITHER TECHNICIAN ON BOARD. SUSPECT ODOR MAY HAVE BEEN RTV, AS A/C RECETLY OUT OF C-CHECK. OPS CHECK OF ALL BLEED VALVES HP/LP BOTH ENGINE GOOD.