What was found
LEFT ENGINE MAX EGT WITH OIL PRESSURE AND OIL QUANTITY INDICATIONS AT ZERO. JUST PRIOR TO LIFT OFF, THE LEFT EGT WAS GOING MAXIMUM/MINIMUM AT AN INAPPROPRIATE RATE FOR THE ENGINE THRUST THAT WAS SET. LEFT ENGINE OIL PRESSURE WAS BLANK, POSSIBLY INDICATING THAT A MONITORING SYSTEM WAS AT FAULT. NO OIL PRESSURE LIGHTS OR OTHER NOTABLE INDICATIONS PRESENT. NO CAUTIONS OR WARNING ON THE EICAS. AIR TURN BACK TO KILN WITH AN EMERGENCY DECLARATION. LANDING UNEVENTFUL WITH NO ADDITIONAL PRECAUTIONARY ACTIONS. ON LANDING, CREW NOTED MAINTENANCE STATUS MESSAGE WITH AN EICAS DISAGREE. FLIGHT GROUNDED FOR FAULT ISOLATION. WORK IN PROGRESS.