What was found
(CAN) EMERGENCY DECLARED FOR LOSS OF GREEN HYDRAULIC SYSTEM, EMERGENCY VEHICLES CALLED OUT. EXPECTING TOW OFF OF RUNWAY, SOME PRESSURE HAS RETURNED, LANDING GEAR DOWN WITHOUT MANUAL PROCEDURES. FOUND LT GREEN HCU PIPE LEAKING. REPLACED PIPE IAW AMM 29-11-49. LEAK AND FUNCTIONAL CKS CARRIED OUT. NO FAULTS.