What was found
LEFT ENG PRV EICAS MSG FLASHED AFTER TAKEOFF. L ENG PRV STATUS MSG ON FOR REST OF FLIGHT. FOUND LEFT PRV AND PRC FAULT LIGHTS. PERFORMED PRV-PRC SYSTEM HEALTH CHECK IAW AMM 36-00-99-705-160, FOUND PRC NOT REGUATING AT ANY REGULATED PRESSURES. REMOVED AND REPLACED LT PRC IAW AMM 36-11-19/401 CONFIG 3, OPS CHECKED NORMAL. NO LEAKS NOTED. RAN ENG 1 IAW AMM 71-00-00-501 AT GROUND IDLE & LT ENG BLEED OPS NORMAL . LT ENG PRV STATUS MSG NOT DISPLAYED.