What was found
RT ENG BLEED OFF EICAS MSG ON TAXI OUT. RTB.(<P>REMOVED AND REPLACED R/H ENG PRSOV ASSY PER AMM 36-11-09/201. PERFORMED ENG RUN. NO HELP. REF AMM 71-00-00/501. ENG RUN BY 9811012 GH KIM FOR FURTHER T/S..</P> / <P>LP 1471728: BITE CHECK AT AIR SUPPLY BITE MODULE, NO FAULT. REMOVED AND REPLACED R/H AIR SUPPLY CONTROL CARD. STILL NO HELP. NEED FURTHER T/S. SUPPLY CONTROL CARD R/R REF AMM 36-11-12/401. CONTINUE T/S .REMOVED AND REPLACED R/H HPSOV PER AMM 36-11-07/401. STILL NO HELP. CONTINUED T/S FOUND PRSOV BAD FROM STOCK. REMOVED AND REPLACED PRSOV PER AMM 36-11-09/201. ENG RUN BY 981107. BLEED INDICATION ALL NORMAL. A/C OK FOR SERVICE. </P>)