What was found
AIRCRAFT WAS GROUNDED: UPON LANDING AND AFTER APU START THERE WAS AN UNUSUAL ODOR NOTICED BY THE ENTIRE CREW. IT WAS AT THE FRONT AND AFT OF THE AIRCRAFT. DIFFERENT THAN A FUEL SMELL AND CAME ON EVERY TIME THE APU BLEED WAS CYCLED. ACCOMPLISHED FIM 49-52-00-810-801 INCLUDED GVI WITH NO OIL OR HYDRO CONTAMINATION ON INLET, PLENUM, DOOR SEALS, WHEEL WELL HYDRO COMPONENTS AND DRAIN HOLES FREE OF DEBRIS. RUN APU AND NO ODORS EITHER FORWARD OR AFT FLIGHT COMPARTMENT.