As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SIGNIFICANT EVENT - ACFT 108UX DIVERSION TO CYS FLT 5121. PILOTS REPORTED RAPID DEPRESSURIZATION AT 25,000 FT. PASSENGER OXYGEN MASKS DROPPED. LT SHAFT ASSY (P/N120-42892-001) AND COVER DOOR P/N120-48319-001 IN THE LT VENTILATION VALVE ASSY WERE REMOVED ANRE REPLACED IAW MM 21-51. OPERATIONAL CHECKS WERE GOOD. (S)