What was found
DURING INITIAL T/O ROLL L ENG BLEED AND MSG ILLUM FWD TO MCO PLACARDED HPSOV IAW MEL 36-11-04 AND LT ENG THRUST REVERSER DEACTIVATED IAW MEL 36-11-02 DISP GRANTED. R & R LT ENG PRV IAW AMM PERFORMED HIGH PWR ENG RUN DUCT PRESS FOR LT ENG LOW. NO MESSAGES NOTED SUSPECT PRSOV--603133. REMOVED PRSOV IAW AMM 36-11-09-002-033-2 INSTALLED PRSOV IAW AMM STILL NEEDS ENG RUN CHECK 493775. PERFORMED POWER ASSURANCE CHECK IAW AMM ALL NML. ETOPS CATEGORY 'E': PROBLEMS WITH SYSTEMS CRITICAL TO ETOPS.