What was found
ACRID ODOR IN COCKPIT ON TAKEOFF ROLL AND TAKEOFF CLIMB. NEARLY CAUSE FOR ABORT. ODOR SLOWLY DISSIPATED ON CLIMB. ODOR MUCH LIKE A HOT PAC. SUSPECT LT ENGINE. REPLACED NR 1 ENGINE. RAN ENGINE AT IDLE FOR 5 MINUTES, CHECKED EPCS PAGE OF EICAS FOR FAULTS. CHECKED FOR LEAKS AT MAIN OIL FILTER, LAST CHANCE OIL FILTER, NR 4 BEARING SCAVENGE MANIFOLD, OIL FILTER DIFFERENTIAL PRESSURE SWITCH, CHIP DETECTORS, AIR-OIL HEAT EXCHANGER, SCAVENGE PUMP, OIL TANK AND ACCESSORIES, OIL PRESSURE TRANSMITTER, AND LOW OIL PRESSURE SWITCH. ACP LEAK CHECK DURING IDLE RUN. NO LEAKS OR DEFECTS NOTED.