What was found
AFTER SELECTING LANDING GEAR DOWN "GEAR" AMBER LIGHT ILLUMINATED AND "GEAR DISAGREE" EICAS MESSAGE APPEARED. AFTER SEVERAL SECONDS THE EICAS MESSAGE AND LIGHT BOTH EXTINGUISHED. PERFORMED BITE PROCEDURE ON PSEU PER FIM 32-09 FAULT TREE 802. FAULT CODES APPEARED AS FOLLOWING : (424) (423) (422) (421) AMM 32-31-01-4 , 32-09-04-4 - REMOVED AND REPLACED LANDING GEAR CONTROL MODULE M937 UP TO STEP 3.D (11). STARTED TO DO THE SYSTEM TEST OF THE POSITION INDICATION AND WARNING AND COULD NOT GET PAST 2.G(11). NO GEAR DOOR EICAS MSG AND GETTING A CONFIG A CONFIG GEAR NOT DOWN WARNING. REMOVED AND REPLACED PSEU AS PRECAUTIONARY - NO HELP STILL GETTING FAULT CODES FOR LANDING GEAR SYSTEM 1 AND 2 FAULT CODES 421, 422, 423, 424. REF FIM 23-09 F/T 802 SHEET 10 NEEDS WIRES CHECKED PER FAULT CODE TABLE 104. FURTHER T/S REQUIRED. PERFORMED CONITNUITY AND SHORT TESTS OF WIRES FROM LANDING FROM LANDING GEAR LEVER MODULE TO PSEU REFERENCING B757 FIM 32-09 FAULT TREE 802 SHEET 10 TABLE 104 AND WDM 32-61-12 AND 32-61-11. NO DEFECTS NOTED. CONTINUED WITH LANDING GEAR MODULE INSTALL REF AMM 32-31-01-4. COMPLETED STEPS 3.D. 11 AND 3.D.12. OPS TEST GOOD. REQUIRES EGPWS OPS TEST STEP 3D.14. ACCOMPLISHED EGPWS TEST FOR LANDING GEAR DISCRETE INPUT TEST. LANDING GEAR MODULE INPUTS TEST GOOD WITH EGPWS SYSTEM. REF B757 MM SEC 34-46-98-5-0 SEC 3.I.3.B