What was found
RT ENG BLEED CAUTION LT ILLUMINATED SOON AFTER TOP OF DESCENT @ APPROX FL290 AT THRUST IDLE. COMPLETED QRH PROCEDURES AND LIGHT REMAINED ON. GROUNDED - YES. STATUS MSG "BLEED PRSOV R" WITH MTX MSGS 36-00171 AND 36-11041. BLEED TRIP RESET. ELECTRICAL LRU - GROUND TEST PER AMM 36-00-00-710-801 "FAILED" ON MULTIPLE ATTEMPTS. REMOVED AND REPLACED RIGHT ENGINE PRSOV REF AMM 36-11-04. OPS + LEAK CHECK GOOD. BLEED LIGHT AND STATUS MESSAGE CLEARED. FAN COWLS AND T/RS OPENED AND CLOSED REF AMM TASK 71-11-04 AND 78-31-00. ETOPS GROUND VERIFICATION SUCCESSFUL.