What was found
MSN - FLT 9120 - DURING TAKEOFF, RIGHT LANDING GEAR DID NOT SHOW UP AND LOCKED. CREW FOLLOW QRC PROCEDURES, PROBLEM STILL PERSIST. CREW RETURNED TO MSN SAFELY. FOUND DE-ICER FLUID HAD BEEN SPRAYED ON LANDING GEAR AREA. CLEANED CANNON PLUG AND CONTACTS ON PROXIMITY SWITCHES. SWUNG GEAR, OPS CHECK GOOD. (M)