As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK, EICAS MESSAGE, LT ENGINE BLEED VALVE AND OVERHEAD PANEL LT ENGINE BLEED LIGHT ILLUMINATTED DURING CRUISE AT FLT 340. FOUND AND REPAIRED BROKEN WIRE AT PRSOV VALVE TERMINAL 1, IAW STANDARD PRACTICE 12-00 RAN ENGINE AND OPS CHECKED IAW AMM 36-11-09.