What was found
UPON ROTATION, RECEIVED "GEAR NOT DOWN" WARNING MSG. A MASTER AURAL WARNING. RAN ASSOCIATED NON-NORMAL CHECKLIST. ADDITIONALLY, "AIR GND DISAGREE & LANDING GEAR MONITOR" STATUS MSG.(<P>REMOVED AND REPLACED WEU LANDING CONFIGURATION WARNING CARD MODULE (M983) IAW B767 AMM 31-51-04. OPS CHECK GOOD IAW B767 AMM 31-51-04. REMOVED AND REPLACED PROXIMITY SWITCH ELECTRONICS UNIT (PSEU) IAW AMM 32-09-04. PERFORMED OPS CHECK GOOD. ALSO, DURING TS, FOUND LH GEAR SYS 1 TILT SENSOR S245 EXTREMELY DIRTY AND FULL OF GREASE. CLEANED UP SENSOR AND PERFORMED TILT SENSOR TEST. TEST OK IAW AMM 32-09-07. </P>)