What was found
LEFT ENGINE HAD MOMENTARY FLAMEOUT IN FLIGHT AT FL210-11 DEGREES W/TRACE ICE, IGNITION KICKED IN RIGHT AWAY. PERFORMED ENGINE RUN AFTER LT ENGINE BORESCOPE TO VERY PROPER ENGINE PERFORMANCE. ALSO, PERFORMED ENGINE OVERSPEED TEST IAW COLGAN WORKCARD 73-20-01S, OPS CHECK GOOD.