What was found
PDX - STRONG ODOR OF OIL IN THE CABIN WHILE ON THE GROUND, IMPROVES AFTER APU IS SHUT DOWN. MAINTENANCE COULD NOT DUPLICATE ODOR. APU OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
PDX - STRONG ODOR OF OIL IN THE CABIN WHILE ON THE GROUND, IMPROVES AFTER APU IS SHUT DOWN. MAINTENANCE COULD NOT DUPLICATE ODOR. APU OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.