What was found
AT CRUISE MASTER CAUTION ENG 2 HYD LOW PRESSURE ACCOMPANIED BY ENGINE VIBRATION. GROUNDED - YES. AIR TURNBACK - PERFORMED CONDITIONAL INSPECTION PER MM 05-51-35 SN 68400 REMOVED #2 ENGINE EDP PER AMM 24-11-11. INSTALLED ENGINE #2 EDP IAW AMM TASK 29-11-11-400-801 SUBTASK 29-11-11-020-012 UP TO STEP J PERFORMED. ACCOMPLISHED HYDRAULIC SYSTEM B FLUSHING PER AMM 29-11-00-170-801 AND FINISHED INSTALLATION OF #2 EDP PER AMM 29-11-11-400-801 STEP J-K(3), OPS & LEAK CHECK GOOD AND NO VIBRATION NOTED. REF LP# 60640626 & LP # 60640627 FOR PLT DEFERRALS OF SYSTEM B HYDRAULIC FILTERS.