As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO FAIL LIGHT ILLUMINATED AFTER LANDING SWITCH STILL IN AUTO POSITION BUT ALTN LIGHT ILLUMINATED ALSO. GROUNDED - YES. REMOVED AND REPLACED AFT OUTFLOW VALVE ASSEMBLY REF B737-900 AMM 21-31-03. OPS CHECK GOOD. NO FAULTS ON DCPC #1 AND #2.