What was found
INSPECTION TYPE:NA** AIR TURN BACK ** L ENG BLEED OFF EICAS ILLUMINATED. L ENG BLEED OFF LIGHT REMAINED ILLUMINATED . QRH PROCEDURE COMPLETED. TURNBACK AFTER CONSULTATION WITH COMPANY. COMPANY REQUESTED CREW RETURN TO KIX TO REPAIR AIRCRAFT AND ACCOMODATE CREW.C/W AIR SUPPLY CONTROL SYSTEM BITE PER MM36-23-00-501,FOUND L PRSOV FAULT IN BITE. R/RED LH PRSOV PER MM36-11-09-201, TEST OK. NO LEAKAGE NOTED & NO FAULT FOUND IN BITE. PRECAUTIONARY REPLACED BLEED AIR CONT CARD PER MM36-11-12-401 RUN ENG PER MM71-00-00-201. ALL IND NORMAL. PN ON/OFF799801-4 SN ON