As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYS - F/O ADI AND HSI ARE BLANK WITH SG FAIL MESSAGES DISPLAYED ON BOTH INDICATORS SELECTING ALT EFI CORRECTS FAULTS. COULD NOT DUPLICATE. TROUBLESHOT IAW FIM 34-22 00101, FIG 104 SYS TESTS NORMAL NO 15 DAY HISTORY. PERF MCDP TEST 30 NO FAULTS FOUND EICAS BITE & LIGHT TEST NORMAL.