What was found
AT 3000', 170KT IAS, PUT GEAR HANDLE DOWN AND FLAPS TO 20 FOR BEFORE LANDING CHECK LIST. NOSE GEAR DID NOT GO DOWN (NO LIGHT) AND LEFT HYDRAULIC SYSTEM PRESSURE EICAS WITH GEAR DISAGREE MSG. COMPLIED WITH QRH, EMERGENCY DECLARED. FOUND NOSE GEAR STEERING PRESSURE FLEX LINE LEAKING. REMOVED AND REPLACED NOSE GEAR STEERING FLEX PRESSURE LINE. REPLACED NOSE GEAR STEERING RETURN FLEX LINE AS PRECAUTIONARY. SERVICE LEFT HYDRAULIC SYSTEM REF AMM 12-12-01-3. CYCLED NOSE GEAR STEERING, OPERATIONALY CHECKS GOOD AND LEAKS CHECKS GOOD. OK FOR SERVICE.