What was found
EICAS MSG R ENG HPSOV IN FLIGHT, INVESTIGATION C/W IAW FIM 36-10 FAULT TREE 843, FAULT TRACED TO STICKY HPSOV, TRANSFER TO DMI 147169. HPSOV LOCKED OUT. MCC YC TIME 0123Z. FAULT TRACKED TO STICKY HPSOV. RT ENG HPSOV REPLACED IAW AMM 36-11-07-024-001 AND 36-11-07-024-016-001 (OFF PART: PN 802170-12, SN 200106160. AIR SUPPLY CONTROL SYS BITE TEST. FOUND SERVICABLE. NO FAULTS. LOG PAGE 1491387: R/H ENGINE HPSOV CONTROLLER REPLACED IAW AMM 36-11-08 PB 400. LEAK CHK C/O SATIS. AIR SUPPLY BITE SYSTEM TEST C/OUT IAW 36-23-00 PB 501, NIL FAULTS RECORDED.