As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PILOT NOTICED THAT THE HYD INSPECTION DOOR ON THE FWD TRANSMISSION DECK CREST COWLING WAS MISSING FROM THE ACFT DURING A PREFLIGHT INSPECTION. OBTAINED & INSTALLED A SERVICEABLE INSPECTION DOOR. NO OTHER INFORMATION IS KNOWN AT THIS TIME CONCERNING THE WHEREABOUTS & CAUSE OF THIS INSPECTION DOOR SEPARATING FROM THE ACFT.