As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH FL200, AUTO FAIL LIGHT ILLUMINATED, PRESSURIZATION WAS GOOD. ACCOMPLISHED QRH PROCEDURE. CONTINUED FLIGHT IN ALTERNATE MODE. ACFT GROUNDED. RESET THE CABIN PRESSURE CONTROL SWITCH TO AUTO. OPS CHECKED NORMAL IAW FIM 21-31, TASK 827.