What was found
(CAN) SHORTLY AFTER DEPARTING, CREW HAD A MAINTENANCE ISSUE. UPON DISCUSSING THE NATURE OF THE FAILURE WITH MOC, THE DECISION TO RETURN WAS MADE. IN FLIGHT HYD 2 EDP FAIL EICAS ADVISORY MSG. NR 2 EDP PRESS SWITCH REPLACED AS PER AMM 29-31-03-000-801-A.NO FIX. NR 2 EDP REPLACED AS PER AMM 29-11-01-000-801-A CHECKS SERVICEABLE C/S COWLS CLOSED.