As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAND ALT WINDOW DISPLAYING UNREADABLE DIGITS. DIGITS OK WHEN F/O SET THEM ON PREFLIGHT CHECKLIST. 30 THINK IT DID THIS ON POWER CHANGE OVER. PERFORMED FIM 21-31, TASK 803 CABIN PRESS CONT DISPLAY FAULT. DISPLAY WOULD NOT RESET. R & R CABIN PRESS CONT MODULE REF MM 21-31-02-000-801. GROUND VERIFICATION CHECK PASSED REF MM 21-31-00-700-802 & MM 21-31-00-710-801. ACFT OK FOR ETOPS SERVICE.