As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL370, AUTO FAIL LIGHT ILLUMINATED. PERFORMED QRH PROCEDURE. SWITCHED CONTROLLER TO ALTERNATE. PRESSURIZATION CONTROLLABLE. ACFT GROUNDED. COMPLIED WITH BITE TEST PROCEDURE FOR NR 1 & 2 CABIN PRESSURE CONTROLLERS FOUND LRU FAILED ON NR 1, CLEARED EXISTING FAULT. NO FAULT HISTORY NOTED, GROUND VIRIFICATION OF THE SYS WAS SUCCESSFUL IAW FIM TASK 21-31, TASK 801. OK FOR SERVICE.