As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - MAIN LANDING GEAR DOOR REMAINED OPEN AFTER GEAR RETRACTION AND ON APPROACH TO PDX. MAIN LANDING GEAR DID NOT EXTEND ON RETRACTION. PERFORMED ALT EXT AND ALL GEAR INDICATED GREEN PRIMARY AND ALT INDICATION. THIS SDR IS LEFT OPEN DUE TO NO PAPERWORK AS OF 9/11/07.