B757 First Officer reported EICAS indicated L Engine Bleed Failure shortly after reaching cruise at FL300. The flight crew attempted resetting the Bleed Valve and it failed again. Flight crew elected to perform an air turn back and make a precautionary landing at departure airport.

Narrative

Shortly after reaching cruise at FL300; EICAS (Engine Indicating and Crew Alerting System) indicated L Engine Bleed Failure. We ran the associated QRH (Quick Reference handbook) and reset the bleed; which returned to normal function. About 15 minutes later the L Engine Bleed Valve failed again. This was repeated three times so we decided to discuss it with Dispatch and Maintenance. After we established a connection with Dispatch and Maintenance and described the situation Dispatch and Maintenance both left the decision up to us. M/C (Maintenance Crew) specifically mentioned that this aircraft had no history of this problem. We decided to continue discussing our options and continue the flight to ZZZ while doing so. As we continued the discussion after disconnecting with Dispatch and further discussing the best action; the left engine bleed failed again and left us with little confidence that it could be relied upon. The bleed reset via the QRH procedure; but because it seemed unwise to continue an over water ETOPS flight with what was effectively a single reliable bleed source; we agreed our best course of action was to return to ZZZ1. During the diversion back to ZZZ1; the Bleed Valve continued to fail regularly every 15-20 minutes for a total of six times; resetting successfully each time. The final time was close to top of descent; and the Bleed reset and did not fail again. The rest of the diversion was uneventful. Upon reaching the gate; local ZZZ1 maintenance came out to get information for the write-up. While discussing the Engine Bleed failure; the ZZZ1 Maintenance Technician said that the airplane had a specific history of this bleed failure multiple times in the last couple of days. The discrepancy between M/C and local MX (maintenance) understanding of the aircraft history is concerning; especially as it pertains to the information inputs that were used in making a decision to continue an over water ETOPS flight. It is extremely important that these decisions be made with accurate information.