What was found
EAI PRSOV R, CREW STATED THAT THEY RECEIVED AN EICAS MESSAGE FOR RT ANTI-ICE VALVE BEING FAULTED IN THE CLOSED POSITION. TRIED MULTIPLE TIMES TO MANUALLY OPEN VALVE, ALL ATTEMPTS FAILED. REPLACED ENG 2 ENGINE ANTI-ICE PRESSURE SENSOR (P1) IAW AMM A-30-21-04 INCLUDING AND UP TO INSTALLATION STEP D.(4), STEP E.(1). SYSTEM TESTED IAW AMM A-30-21-00-20E-300B-A, OPS CHECK FAILED, MAINT MSG 30-10022. PRSOV, CONTROLLER WAS ALREADY REPLACED, & VALVE FILTER CLEANED. PERFORMED WIRING CHECKS OF ANTI-ICE PRESSURE SENSORS M3021002, M3021007, & ANTI-ICE VALVE CONTROLLER M3021001 AS OUTLINED IN STEPS (5), (6), AND (10) IN FIM 30-20-F1-05A-421A-A. REF WDM 30-21-12-01A-051A-D. ALL WIRING CHECKED GOOD AND CONTINUOUS. ANTI-ICE CONTROLLER FILTER REPLACED IAW AMM 30-21-03 UP TO STEP 1.C. PERFORMED ENG RUN IAW ENG ANTI-ICE SYS TEST, AMM B787-A-30-21-00-20E-300B-A. SUSPECT VALVE NOT OPENING. INLET COWL WAS COLD TO TOUCH. R & R NR 2 ENG PRSOV. COMPLETED REST OF INSTALL OF THE PRSOV IAW AMM DMC-B787-A-30-21-08-00B-720A-A. COMPLETED LEAK CHECK. LEAK CHECK PASSED.