What was found
LG NOSE DOOR OPEN CAUTION ON EICAS AFTER GEAR LEVER WAS SELECTED UP ON TAKEOFF, PERFORMED QRH MESSAGE, EXTINGUISHED AFTER GEAR WAS LOWERED DURING AIR RETURN, INDICATIONS WERE NORMAL WITH GEAR DOWN, REMOVED AND REPLACED LT AFT DOOR SENSOR IAW AMM 32-61-13, PG 401, ADJUSTED NLG DOOR POSITION SENSOR IAW AMM 32-61-13-820-802A. REMOVED AND REPLACED NLG AFT DOOR LINKAGE ROD IAW 32-22-03, ACCOMPLISHED NLG GEAR SWING IAW AMM 32-61-13. OPS CHECK OK. (K)