As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1274, CHS-JFK. (AIRCRAFT PERFORMED AN AIR TURN BACK TO CHS) .'LEFT BLEED FAIL CAUTION INFO MESSAGE 36 LEFT BLEED FAIL L PRESSURE SOV INOP ( ENGINE BLEED PRESSURE REGULATING SHUTOFF VALVE (PRSOV) LEFT SIDE CBV OPERATIVE ).' (SUPPLEMENTAL INFORMATION TO FOLLOW)