What was found
LEFT ENG FUEL VALVE REMAINED ON DURING ENTIRE FLT THIS ISSUE HAS RECENT HISTORY AND MAY NEED PRESSURIZING AND DRAIN VALVE SWITCH OR FFG AASY ALONG WITH NECESSARY ASSOCIATED CIRCUIT CHECK PER FIM INCL IN PHOTO. IPC REF FOR PRESSURIZING AND DRAIN VALVE ASSY INCL IPC 73-21-01-05 ITEM 265 AIR RETURN FOR LEFT ENGINE FUEL VALVE EIACS MSG AND LEFT FUEL VA LVE LIGHT ILLUMINATING. DURING THE TAKE-OFF ROLL, PILOTS OBSERVE D LEFT FUEL VALVE EICAS MSG APPEAR AND FUEL VALVE LIGHT ILLUMINA TED. PILOTS CONTINUED FOR SOMETIME UNTIL DECIDING TO RETURN TO F IELD. THESE TWO INDICATORS STAYED ON UNTIL PLANE RETURNED TO FIE LD AND LEFT ENGINE WAS SHUT DOWN. PILOTS STATED THAT LEFT ENGINE OPERATING INDICATIONS WERE NORMAL DURING FLIGHT. REMOVED AND REPLACED ENG 1 PRESSURIZING AND DRAIN VALVE SWITCH ASSY REF AMM TASK 73-21-15-400-801-R00. STILL REQUIRES INSTALLATION TEST 1 AND 2 REF AMM TASK 71-00-00-700-804-R03.