As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYS - APPROACHING WAYPOINT DUETS CAPT'S ADI & HSI WENT BLANK & A/C COMMENCED A TURN (LT) BACK TOWARDS WAY- POINT DINTY. LOWER EICAS DISPLAYED GROUND PROXIMITY COMPUTER BITE. SWITCHING EFI TO ALTERNATE & BACK TO NML RESTORED SYS TO NORMAL. REPLACED CAPT SYMBOL GEN. OPS CK OK IAW MM 34-22-00. PERF MCDP TEST 30 TEST PASSED. ACFT REMAINS IN LAND 3 LMP STATUS.