What was found
DURING ENGINE START, LEFT ENGINE EGT REACHED 689 DEGREES USING RICH. ABORTED THE ENGINE START. FOLLOWED QRH. PERFORMED BOROSCOPE INSPECTION, HP, IP, AND LP TURBINES, AND COMBUSTION SECTION IAW AMM 72-00-00/601. NO LIMITING DEFECTS FOUND. AIRCRAFT OK FOR SERVICE RAN BOTH ENGINES AT IDLE IAW JRH FOR 5 MINUTES AND FOUND ALL PARAMETERS NORMAL. DURING STARTING SEQUENCE, PEAK EGT WAS APPROXIMATELY 350 DEG C ON BOTH ENGINES. PERFORMED TEST NR 13 AT TAKEOFF POWER IAW MM 71-00-00/501 AND FOUND ALL NR 1 ENGINE PARAMETERS IN GOOD RANGE. ACFT OK TO CONTINUE.