What was found
N-W-STRG FAULT. WILL REQUIRE TROUBLESHOOTING. ACCOMPLISHED TSM. REPLACED SERVO CONTROL NW STEERING, NO HELP. TS DATA GIVES FAULT CODE "53". UNABLE TO CLOSE L/G DOORS. RESET LGCIU'S, NO HELP. TRIED NEW LGCIU'S, NO HELP. ORIGINALS REINSTALLED. REPLACED SEL VLV LG DOORS 41GA, NO HELP. SERVICED NLG DOOR CLOSING SAFETY VLV, NO HELP. ITEM ROLLED FWD. REPLACED LANDING SAFETY VALVE. LEAK CK AND VLV OPS NORMAL. NWS NORMAL WITH NO MESSAGES DISPLAYED.