What was found
HNL - FLT 125 EN ROUTE HNL TO PHX. WHILE CLIMBING OUT OF FL 250, THE LEFT ENGINE BLEED LIGHT ILLUMINATED, FOLLOWED BY A LEFT CENTER FUEL PUMP PRESSURE LIGHT. SHORTLY AFTERWARDS, THE LEFT N3 INDICATION WAS ZERO. THE FLIGHT RETURNED TO FIELD HNL. UPON LANDING, THE LEFT ENGINE OIL PRESSURE INDICATED AMBER AND WENT DOWN TO 22 PSI. DURING TAXI, THE CREW SHUT DOWN THE LEFT ENGINE. AT THE GATE, THE LEFT GENERATOR CONTROL OFF LIGHT ILLUMINATED. MAINTENANCE INSPECTED THE LEFT ENGINE CHIP DETECTORS, AND INSPECTED AND REPLACED THE OIL SCAVENGE AND PRESSURE FILTERS. NO DEBRIS OR CONTAMINATION WAS FOUND. ALSO REPLACED THE LEFT ENGINE OIL PRESSURE TRANSMITTER. FINALLY, MAINTENANCE REPLACED THE LEFT ENGINE N3 TACHOMETER GENERATOR, WHICH IS IDENTIFIED AS THE CAUSE OF THE MULTIPLE SYSTEM FAILURES. AIRCRAFT OPERATIONALLY AND LEAK CHECKS OK.