As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRESSURIZATION SYSTEM NEEDS CHECKED. LOST PRESSURIZATION AT FL280. EICAS MESSAGE PRESS AUTO FAULT APPEARED. MAINTAINED PRESSURE AT 10000 FT. EMERGENCY DECLARED. PRESSURIZED A/C IAW AMM 21-31-00. OPS CHECK GOOD T/S IAW FIM 21-31-00-810-806-A, FOUND TO BE TRANSITORY CONDITION OF CPCS CONTROLLER