What was found
LEFT ENGINE BLEED OFF LIGHT ON AND LT ENGINE BLEED OFF EICAS MESSAGE, WITH ENGINE RUNNING, ENGINE BLEED SWITCH ON, LT AND RT ISOLATION VALVES CLOSED, A/C PACK SELECTED ON, AND DUCT PSI IS ZERO. OFF LIGHT STAYS ON WHEN N1 IS ABOVE 41 PERCENT. LT DUCT PRESSURE IS 3 PSI. REPLACED AIR SUPPLY CONTROL CARD PER MM. GROUND CHECKED NORMAL.