As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"AUTOFAIL" ILLUMINATED ON PRESSURIZATION PANEL "ALTN" ALSO ILLUMINATED. GROUNDED - YES. PERFORMED B737-800 FIM 21-31 TASK 827. PER INITIAL EVALUATION FAULT IS TRANSITORY POSITION OF SWITCH, LIGHT EXTINGUISHED. PERFORMED REPAIR CONFIRMATION AT END OF FIM. NO FAULTS PRESENT OPS CHECKS GOOD.