As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN ALTITUDE WARNING AT FL 250. TROUBLESHOT AND FOUND THE AUTO PRESSURIZATION DIGITAL CONTROLLER DISPLAY ELEVATION SWITCH TO BE STICKING. SUSPECT DIGITAL CONTROLLER IS BAD. REPLACED DIGITAL CONTROLLER IAW AMM 21-31-01-000-801-A, & 21-31-01-400-801-A. PERFORMED FNC OF PRESSURIZATION CONTROL IN AUTO IAW 21-31-00-700-802-A. OPS CHECKED NORMAL.