What was found
SHORTLY AFTER TAKEOFF, METALLIC CLANKING NOISE WAS HEARD FROM THROTTLE QUADRANT. IT WAS STEADY CADENCE AT ABOUT 2 BEATS PER SECOND. THAT WAS ABOVE ABOUT 290 KIAS. ACCELERATING ABOVE 305 KIAS CLUNKING SOUND WAS ALSO HEARD, SAME CADENCE. CREW REPORTED VERBAL CYMBAL TYPE SOUND FROM ALT PITCH TRIM. MAT SHOWED FAULT OF PFC LT LANE 2 LATCHED. REPLACED PFC LT IAW FIM TASK 27-02-00-810-886. OPERATIONS TESTED NORMAL PRESS. PITOT & STATIC TO SIMULATED 315KT 11K'' NO ABNORMALITIES IAW AMM 34-11-00. PERFORMED EXTERIOR VISUAL INSPECTION & INSIDE E & E BAYS, NO DEFECTS E7291.