As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRESSURIZATION AUTO FAIL AMBER LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED AUTO FAIL LIGHT "ON" FAULT ISOLATION REF B737-800 FIM 21-31 TASK 827, C/W ETOPS GROUND SYSTEM OPERATIONAL VERIFICATION PERFORMED ON BOTH #1 & 2 CONTROLLERS, NO FAULTS NOTED.