What was found
FLT#1578, DTW-BOS. (AIRCRAFT DECLARED AN EMERGENCY INTO BOS) ' REMOVED PANEL 481CL,485AL,485BL,481DR & 485AR FOR MX HYD Y RSVR LOW ITEM 1: HYD Y RSVR LOW LVL ECAM IN FLIGHT; SEE WO# 12001476 AND NON-ROUTINE #00003 AND NR00004 FOR CORRECTIVE ACTION. REMOVED AND REPLACED HED PRESS LINE IAW AMM 29-13-49. OPS CHECK GOOD, NO LEAKS NOTED. (SUPPLEMENTAL INFORMATION ADDED TO THE DESCRIPTION)