What was found
FLT 904JB - ORD-JFK - UPON LANDING GEAR EXT LG LEVER DISAG MESSAGE ON EICAS. RIGHT MAIN GEAR DID NOT INDICATE DOWN, INITIATED GO-AROUND. AFTER 2 MINUTES WITH LG LEVER DOWN MESSAGE WENT AWAY AND ALL GEAR DOWN AND GREEN INDICATED. GREASED UPLOCK AND UPLOCK ROLLER. FOUND BOTH UPLOCKS ROLLERS WITH LACK OF LUBRICATION. GREASED LOCKS AND ROLLER AS REQUIRED PER 12-22-00, ACCOMPLISHED TSI, OPS CHECK LDG, A/C OK FOR SERVICE.