As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE FROM PDX TO BFI, THE FLIGHT CREW NOTICED THE NUMBER ONE ENGINE OIL QUANTITY DECLINING. THE FLIGHT CREW FOLLOWED COMPANY PROCEDURES AND SECURED THE ENGINE AND CONTINUED TO BFI FOR AN UNEVENTFUL LANDING. MAINTENANCE INSPECTED THE ENGINE LOCATING THE STARTER OIL SERVICING CAP OFF. MAINTENANCE SERVICED THE ENGINE STARTER AND SECURED THE SERVICING CAP. MAINTENANCE PERFORMED LEAK CHECK AND OPERATIONAL CHECK. THE AIRCRAFT WAS RETURNED TO SERVICE.