As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C HAD AN AIR TURNBACK DUE TO LEFT ENGINE BLEED OFF LIGHT ILLUMINATED AFTER 80 KTS DURING TAKEOFF AFTER RESETTING THE ENGINE BLEED SWITCH THE LIGHT EXTINGUISHED. THE LIGHT RE-APPEARED TIMES THROUGHOUT THE FLIGHT BOTH ENGINE DUCT PRESS WERE EVENLY MATCH BUT VARIED IN DIFFERENT OCCASIONS BY 23-30 PSI. REPLACED PRSOV AS PER MM 36-11-09 LEAK AND OPS CHECK GOOD.