As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE FLIGHT LEVEL 400 WE HAD A CABIN ALTITUDE LIGHT AS WELL AS A CABIN ALTITUDE WARNING HORN. WE STARTED AN EMERGENCY DESCENT AND COMPLIED WITH THE CABIN ALTITUDE WARNING EMERGENCY DESCENT CHECKLIST PER THE QRH. / DUE TO RESCENT PRESSURIZATION ISSUES PERFORMED JO#7772; JO#7773; JO#7774; JO#7775; JO#7776; JO#7777 AND JO# 7778