On 25 April 1944, Amycus got underway for Cape Cretin, New Guinea, where she joined a convoy bound for Hollandia. She reached that base on 3 May, and assumed duty as a repair ship and the flagship of the landing craft control officer. The ship remained in Humboldt Bay through the summer and autumn carrying out repair and tender services for various landing craft. On 20 December, Amycus left Hollandia and proceeded to Seeadler Harbor, Manus Island. A week later, she sortied with a task group destined to take part in the Lingayen Gulf landings. As her convoy crossed the South China Sea, there were numerous air raid alerts, but only one attack materialized. On 7 January 1945, two enemy planes came in low to attack. One was shot down by a screening vessel, and the other broke off her approach and escaped undamaged.[3]
Amycus anchored in Lingayen Gulf on 9 January, and the bombardment of the Luzon beaches began at 07:00 that day. Shortly thereafter, the ship began repairing battle-damaged landing craft. During the Allied assault, Amycus fired intermittently at enemy aircraft. While at anchor on 29 January, a friendly plane accidentally jettisoned a bomb which exploded about 60 ft (18 m) off her port quarter. Shrapnel from the explosion killed three and wounded nine crew members and caused minor damage to the repair ship's hull.[3]
Amycus remained in Lingayen Gulf through 26 June, when she sailed for Subic Bay in the Philippine Islands. Upon her arrival there, the ship operated under Service Squadron 3 at the naval base at Subic Bay. The Japanese surrender in August found Amycus still providing services at Subic Bay. She remained there until 27 October, when she shaped a course for the United States.[3]