As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT PERFORMED AN UNSCHEDULED LANDING AT HMO AS A CONSEQUENCE OF DURING FLIGHT AT 370 FT AIRCRAFT WAS DEPRESSURIZED AND DESCENDED AT 150 FT WITH CABIN ALTITUDE OF 11,000 FT AND ORAL ALARM. THE OXYGEN MASKS WAS NOT NECESSARY ACTIVATED DUE TO PRESSURE WAS STABLE. DURING OVERNIGHT SERVICE FLOW CONTROL VALVE WAS REPLACED IAW MM 21-31-00 AND BOTH SYSTEMS WERE CHECKED BY LEAKS IAW MM 21-00-00 TO 7.7 PSI, ALL CORRECT.