What was found
STATUS MSG: "R HYD SYS MAINT" DISPLAYED IN CRUISE. RH HYD PRESSURE AT 1620 AT CRUISE. NOTICED RT ENGINE OIL PRESSURE INDICATED RED, AND MAINT FAULT OF RT IDG, AND R HYD PRIM PUMP CAUTION MESSAGE. AIR TURN BACK TO CVG. (ATB) REMOVED AND REPLACED RH ACMP IAW AMM 29-11-01 ACMP .R & R RT HYD SYS PRESSURE TRANSMITTER IAW AMM 29-31-01.. INSTALLED NEW FILTER ELEMENT ON RT PYLON RETURN FILTER MODULE IAW AMM 29-11-15.SERVICED RT HYD SYS IAW AMM 12-12-01.. R & R TEE FITTING FROM #2 SPOILER PCA & TORQUED IAW AMM 20-11-00. LEAK CHECK GOOD.THE FAULT OF THE RH HYD PRESSURE WAS #2 AND # 11 SPOILER PCA'S BYPASSING ,THEY WERE REPLACED & MEASSAGE CLEARED IAW AMM 27-61-02 OPES & LEAK CHECK GOOD . A/C WAS RETURNED TO SERVICE.