What was found
EAI PRSOV L LEFT ENGINE ANTI-ICE (EAI) PRSOV FAILURE. FIM TASK REF : 31-90-F8-01A-421B-A CMC MSG# 3010021 FLIGHT STATUS: L INTERMITTENCE CODE: M PH: CRUISE NARRATIVE: 30 WWFDS EAI CIPS OPS ( LEFT) CMC MSG# 3010021 FLIGHT STATUS: L INTERMITTENCE CODE: M PH: CRUISE NARRATIVE: REMOVED AND REPLACED ENGINE ANTI-ICE PRESSURE REGULATING AND SHU TOFF VALVE, REF 787 AMM DMC-B787-A-30-21-08, UP TO STEP 1 B (6). ROTABLE PARTS CHANGE WAS INDICATED - TT # 1161597 SN OFF 7274 VALVE, ANTI-ICE OFF 78-3021-9-9003 7274 ON 78-3021-9-9003 6174 COMPLETED AMM 30-21-08-00B-720A-A STEP 1 C. TO END. OPS AND LEAK CK GOOD. OK FOR SERVICE.