What was found
LOST BOTH LOC AND GS SIGNALS ON BOTH CAPT AND FO'S SIDE ON FINAL APPROACH. *S/D* DUE TO AIR DATA COMPUTER FAULT CODES, THE LEFT AIR DATA COMPUTER WAS REPLACED. ON THE NEXT FLIGHT LEG THE FIRST OFFICER'S GLIDESLOPE AND LOCALIZER FLAGS WERE ON AND OFF DURING FINAL. THE RIGHT MULTI MODE RECEIVER PART NUMBER WAS REPLACED AND OPS CHECK GOOD. ILS SYSTEM OPERATION HAS BEEN NORMAL TO DATE. BOTH REMOVED UNITS WERE CHECKED IN THEIR RESPECTIVE COMPONENT SHOP AND THERE WERE NO FAULTS FOUND IN BOTH CASES.